10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED March 31, 2014

OR

oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 1-7933

Aon plc

(Exact Name of Registrant as Specified in Its Charter)

ENGLAND AND WALES	98-1030901
(State or Other Jurisdiction of	(I.R.S. Employer
Incorporation or Organization)	Identification No.)

8 DEVONSHIRE SQUARE, LONDON, ENGLAND	EC2M 4PL
(Address of Principal Executive Offices)	(Zip Code)

+44 20 7623 5500

(Registrant’s Telephone Number,

Including Area Code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  YES  ý  NO  o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  YES  ý  NO  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  YES o NO ý

Number of Class A Ordinary Shares of Aon plc, $0.01 nominal value, outstanding as of March 31, 2014:  296,483,350

PART I FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

Aon plc

Condensed Consolidated Statements of Income

(Unaudited)

	Three Months Ended
(millions, except per share data)	March 31, 2014			March 31, 2013
Revenue
Commissions, fees and other	$	2,941		$	2,908
Fiduciary investment income	6			7
Total revenue	2,947			2,915
Expenses
Compensation and benefits	1,751			1,725
Other general expenses	727			780
Total operating expenses	2,478			2,505
Operating income	469			410
Interest income	2			1
Interest expense	(58		)	(52		)
Other income	1			9
Income before income taxes	414			368
Income taxes	78			96
Net income	336			272
Less: Net income attributable to noncontrolling interests	11			11
Net income attributable to Aon shareholders	$	325		$	261
Basic net income per share attributable to Aon shareholders	$	1.07		$	0.82
Diluted net income per share attributable to Aon shareholders	$	1.06		$	0.82
Cash dividends per share paid on ordinary shares	$	0.18		$	0.16
Weighted average ordinary shares outstanding - basic	303.5			316.4
Weighted average ordinary shares outstanding - diluted	307.2			320.0

See accompanying Notes to the Condensed Consolidated Financial Statements (Unaudited).

2

Aon plc

Condensed Consolidated Statements of Comprehensive Income

(Unaudited)

	Three Months Ended
(millions)	March 31, 2014			March 31, 2013
Net income	$	336		$	272
Less: Net income attributable to noncontrolling interests	11			11
Net income attributable to Aon shareholders	325			261
Other comprehensive income (loss), net of tax:
Change in fair value of investments	1			—
Change in fair value of derivatives	9			(14		)
Foreign currency translation adjustments	16			(174		)
Post-retirement benefit obligation	26			23
Total other comprehensive income (loss)	52			(165		)
Less: Other comprehensive income attributable to noncontrolling interests	(2		)	—
Total other comprehensive income (loss) attributable to Aon shareholders	54			(165		)
Comprehensive income attributable to Aon shareholders	$	379		$	96

See accompanying Notes to the Condensed Consolidated Financial Statements (Unaudited).

3

Aon plc

Condensed Consolidated Statements of Financial Position

(millions, except nominal value)	Mar 31, 2014			Dec 31, 2013
	(Unaudited)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	338		$	477
Short-term investments	340			523
Receivables, net	2,880			2,896
Fiduciary assets	12,038			11,871
Other current assets	577			563
Total Current Assets	16,173			16,330
Goodwill	9,030			8,997
Intangible assets, net	2,500			2,578
Fixed assets, net	785			791
Investments	143			132
Other non-current assets	1,446			1,423
TOTAL ASSETS	$	30,077		$	30,251
LIABILITIES AND EQUITY
LIABILITIES
CURRENT LIABILITIES
Fiduciary liabilities	$	12,038		$	11,871
Short-term debt and current portion of long-term debt	1,077			703
Accounts payable and accrued liabilities	1,499			1,931
Other current liabilities	967			906
Total Current Liabilities	15,581			15,411
Long-term debt	3,669			3,686
Pension, other post-retirement and other post-employment liabilities	1,573			1,607
Other non-current liabilities	1,248			1,352
TOTAL LIABILITIES	22,071			22,056
EQUITY
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2014 - 296.5; 2013 - 300.7)	3			3
Additional paid-in capital	4,860			4,785
Retained earnings	5,403			5,731
Accumulated other comprehensive loss	(2,320		)	(2,374		)
TOTAL AON SHAREHOLDERS’ EQUITY	7,946			8,145
Noncontrolling interests	60			50
TOTAL EQUITY	8,006			8,195
TOTAL LIABILITIES AND EQUITY	$	30,077		$	30,251

See accompanying Notes to the Condensed Consolidated Financial Statements (Unaudited).

4

Aon plc

Condensed Consolidated Statement of Shareholders’ Equity

(Unaudited)

(millions)	Shares		Ordinary Shares and Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Loss, Net of Tax			Non- controlling Interests			Total
Balance at December 31, 2013	300.7		$	4,788		$	5,731		$	(2,374	)	$	50		$	8,195
Net income	—		—			325			—			11			336
Shares issued - employee benefit plans	0.3		14			—			—			—			14
Shares issued - employee compensation	2.7		(85		)	—			—			—			(85		)
Shares purchased	(7.2	)	—			(600		)	—			—			(600		)
Tax benefit - employee benefit plans	—		44			—			—			—			44
Share-based compensation expense	—		102			—			—			—			102
Dividends to shareholders	—		—			(53		)	—			—			(53		)
Net change in fair value of investments	—		—			—			1			—			1
Net change in fair value of derivatives	—		—			—			9			—			9
Net foreign currency translation adjustments	—		—			—			18			(2		)	16
Net post-retirement benefit obligation	—		—			—			26			—			26
Purchase of subsidiary shares from non-controlling interests	—		—			—			—			1			1
Dividends paid to non-controlling interests on subsidiary common stock	—		—			—			—			—			—
Balance at March 31, 2014	296.5		$	4,863		$	5,403		$	(2,320	)	$	60		$	8,006

See accompanying Notes to the Condensed Consolidated Financial Statements (Unaudited).

5

Aon plc

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Three Months Ended
(millions)	March 31, 2014			March 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	336		$	272
Adjustments to reconcile net income to cash provided by operating activities:
Gain from sales of businesses and investments, net	(5		)	—
Depreciation of fixed assets	60			59
Amortization of intangible assets	86			99
Share-based compensation expense	102			69
Deferred income taxes	10			13
Change in assets and liabilities:
Fiduciary receivables	165			(42		)
Short term investments - funds held on behalf of clients	(271		)	(322		)
Fiduciary liabilities	106			364
Receivables, net	13			174
Accounts payable and accrued liabilities	(468		)	(417		)
Restructuring reserves	(40		)	(16		)
Current income taxes	2			(65		)
Pension, other post-retirement and other post-employment liabilities	(128		)	(196		)
Other assets and liabilities	21			62
CASH (USED FOR) PROVIDED BY OPERATING ACTIVITIES	(11		)	54
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	42			18
Purchases of long-term investments	(10		)	(3		)
Net sales (purchases) of short-term investments - non-fiduciary	183			(16		)
Acquisition of businesses, net of cash acquired	(5		)	(2		)
Proceeds from sale of businesses	1			1
Capital expenditures	(55		)	(60		)
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	156			(62		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(600		)	(300		)
Issuance of shares for employee benefit plans	26			36
Issuance of debt	1,195			1,150
Repayment of debt	(829		)	(715		)
Cash dividends to shareholders	(53		)	(50		)
Purchase of shares from noncontrolling interests	1			(1		)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(260		)	120
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(24		)	5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(139		)	117
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	477			291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	338		$	408
Supplemental disclosures:
Interest paid	$	64		$	32
Income taxes paid, net of refunds	$	66		$	148

See accompanying Notes to the Condensed Consolidated Financial Statements (Unaudited).

6

Notes to the Condensed Consolidated Financial Statements (Unaudited)

1.  Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements and Notes thereto have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).  The Condensed Consolidated Financial Statements include the accounts of Aon plc and all controlled subsidiaries (“Aon” or the “Company”).  All intercompany accounts and transactions have been eliminated.  The Condensed Consolidated Financial Statements include, in the opinion of management, all adjustments (consisting of normal recurring adjustments and reclassifications) necessary to present fairly the Company’s consolidated financial position, results of operations and cash flows for all periods presented.

Certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted.  These Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.  The results for the three months endedMarch 31, 2014 are not necessarily indicative of operating results that may be expected for the full year ending December 31, 2014.

Use of Estimates

The preparation of the accompanying unaudited Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments.  Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances.  Aon adjusts such estimates and assumptions when facts and circumstances dictate.  Illiquid credit markets, volatile equity markets, and foreign currency movements increase the uncertainty inherent in such estimates and assumptions.  As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates.  Changes in estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.

2.  Accounting Principles and Practices

Changes in Accounting Principles

Discontinued Operations

In April 2014, the Financial Accounting Standards Board ("FASB") issued new accounting guidance that increased the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. The guidance is effective for Aon in the first quarter of 2015. The adoption of this guidance is not expected to have a material impact on the Company's Condensed Consolidated Financial Statements.

Presentation of Unrecognized Tax Benefits

In July 2013, the FASB issued guidance on the presentation of certain unrecognized tax benefits on the financial statements. The guidance requires, unless certain conditions exist, an unrecognized tax benefit to be presented as a reduction to a deferred tax asset in the financial statements for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The guidance is effective for Aon in the first quarter of 2014. The adoption of this guidance did not have a material impact on the Company's Condensed Consolidated Financial Statements.

Foreign Currency

In March 2013, the FASB issued new accounting guidance clarifying the accounting for the release of cumulative translation adjustment into net income when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The guidance is effective for Aon in the first quarter of 2014. The adoption of this guidance did not have a material impact on the Company's Condensed Consolidated Financial Statements.

7

3.  Cash and Cash Equivalents and Short-term Investments

Cash and cash equivalents include cash balances and all highly liquid investments with initial maturities of three months or less.  Short-term investments include certificates of deposit, money market funds and highly liquid debt instruments purchased with initial maturities in excess of three months but less than one year and are carried at amortized cost, which approximates fair value.

The Company is required to hold £77 million of operating funds in the U.K. by the Financial Conduct Authority, a U.K. based regulator, which were included in Short-term investments.  These operating funds, when translated to U.S. dollars, were equal to $128 million and $126 million at March 31, 2014 and December 31, 2013, respectively.  Cash and cash equivalents included restricted balances of $125 million and $88 million at March 31, 2014 and December 31, 2013, respectively. The restricted balances primarily relate to cash required to be held as collateral.

4.  Other Financial Data

Condensed Consolidated Statements of Income Information

Other Income

Other income consists of the following (in millions):

	Three months ended March 31,
	2014			2013
Equity earnings	$	5		$	2
(Loss) gain on investments	(1		)	1
Foreign currency remeasurement gain	19			24
Derivative loss	(23		)	(18		)
Other	1			—
	$	1		$	9

Condensed Consolidated Statements of Financial Position Information

Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts is as follows (in millions):

	Three months ended March 31,
	2014			2013
Balance at beginning of period	$	90		$	118
Provision charged to operations	4			10
Accounts written off, net of recoveries	(5		)	(9		)
Effect of exchange rate changes and other	—			3
Balance at end of period	$	89		$	122

Other Current Assets

The components of Other current assets are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Prepaid expenses	$	219	$	229
Taxes receivable	130		111
Deferred project costs	102		98
Deferred tax assets	81		93
Other	45		32
	$	577	$	563

8

Other Non-Current Assets

The components of Other non-current assets are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Prepaid pension (1)	$	659	$	567
Deferred project costs	259		273
Deferred tax assets	180		193
Taxes receivable	100		108
Other	248		282
	$	1,446	$	1,423

  ______________________________________________

(1) Increase in prepaid pensions is primarily due to cash funding of the U.K. pension plans.

Other Current Liabilities

The components of Other current liabilities are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Deferred revenue	$	513	$	475
Taxes payable	140		136
Deferred tax liabilities	53		48
Other	261		247
	$	967	$	906

Other Non-Current Liabilities

The components of Other non-current liabilities are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Deferred tax liabilities	$	365	$	420
Leases	201		204
Taxes payable	194		184
Deferred revenue	128		134
Compensation and benefits	59		105
Other	301		305
	$	1,248	$	1,352

5.  Acquisitions and Dispositions

Acquisitions

During the three months ended March 31, 2014, the Company completed the acquisition of one business in the Risk Solutions segment and one business in the HR Solutions segment.  During the three months ended March 31, 2013, the Company completed the acquisition of one business in the HR Solutions segment.

9

The following table includes the aggregate consideration transferred and the preliminary value of intangible assets recorded as a result of the Company’s acquisitions (in millions):

	Three months ended March 31,
	2014		2013
Consideration	$	5	$	2
Intangible assets:
Goodwill	$	4	$	2
Other intangible assets	4		1
Total	$	8	$	3

The results of operations of these acquisitions are included in the Condensed Consolidated Financial Statements as of the acquisition date.  The results of operations of the Company would not have been materially different if these acquisitions had been reported from the beginning of the period in which they were acquired.

Dispositions

During the three months ended March 31, 2014, the Company completed the disposition of one business in the Risk Solutions segment. Total pretax gain of $1 million was recognized on this sale, which is included in Other income in the Condensed Consolidated Statements of Income. During the three months ended March 31, 2013, the Company completed the disposition of three businesses in the Risk Solutions segment.  No gain or loss was recognized on these dispositions.

6.  Goodwill and Other Intangible Assets

The changes in the net carrying amount of goodwill by reportable segment for the three months ended March 31, 2014 is as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of December 31, 2013	$	6,020		$	2,977		$	8,997
Goodwill related to current year acquisitions	2			2			4
Goodwill related to prior year acquisitions	(1		)	—			(1		)
Foreign currency translation	31			(1		)	30
Balance as of March 31, 2014	$	6,052		$	2,978		$	9,030

Other intangible assets by asset class are as follows (in millions):

	March 31, 2014						December 31, 2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets with indefinite lives:
Tradenames	$	1,019	$	—	$	1,019	$	1,019	$	—	$	1,019
Intangible assets with finite lives:
Customer related and contract based	2,729		1,386		1,343		2,720		1,310		1,410
Marketing, technology and other	587		449		138		584		435		149
	$	4,335	$	1,835	$	2,500	$	4,323	$	1,745	$	2,578

Amortization expense from finite lived intangible assets was $86 million and $99 million for the three months endedMarch 31, 2014 and 2013, respectively.

10

The estimated future amortization for finite lived intangible assets as of March 31, 2014 is as follows (in millions):

	Risk Solutions		HR Solutions		Total
Remainder of 2014	$	77	$	183	$	260
2015	83		212		295
2016	70		177		247
2017	59		141		200
2018	47		93		140
Thereafter	89		250		339
	$	425	$	1,056	$	1,481

7.  Restructuring

Aon Hewitt Restructuring Plan

On October 14, 2010, the Company announced a global restructuring plan ("Aon Hewitt Plan") in connection with the acquisition of Hewitt. The Aon Hewitt Plan was intended to streamline operations across the combined Aon Hewitt organization. The Company incurred all remaining costs for the Aon Hewitt Plan and the plan was closed in the fourth quarter of 2013. For the three months endedMarch 31, 2014 no charges were taken under the Aon Hewitt Plan. For the three months endedMarch 31, 2013, $26 million of restructuring expenses were charged, of which $15 million and $11 million were in the HR Solutions segment and Risk Solutions segment, respectively.

As of December 31, 2013, the remaining liabilities for the Company's restructuring plans were $166 million. During the three months endedMarch 31, 2014, the Company made cash payments of $40 million, partially offset by foreign exchange translation of $1 million, resulting in restructuring liabilities of $127 million as of March 31, 2014.

8.  Investments

The Company earns income on cash balances and investments, as well as on premium trust balances that the Company maintains for premiums collected from insureds but not yet remitted to insurance companies, and funds held under the terms of certain outsourcing agreements to pay certain obligations on behalf of clients.  Premium trust balances and receivables, as well as a corresponding liability, are included in Fiduciary assets and Fiduciary liabilities in the accompanying Condensed Consolidated Statements of Financial Position.

The Company’s interest-bearing assets and other investments are included in the following categories in the Condensed Consolidated Statements of Financial Position (in millions):

	March 31, 2014		December 31, 2013
Cash and cash equivalents	$	338	$	477
Short-term investments	340		523
Fiduciary assets (1)	4,088		3,778
Investments	143		132
	$	4,909	$	4,910

  ______________________________________________

(1) Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

The Company’s investments are as follows (in millions):

	March 31, 2014		December 31, 2013
Equity method investments	$	127	$	113
Other investments	8		10
Fixed-maturity securities	8		9
	$	143	$	132

11

9.  Debt

The Company uses proceeds from the commercial paper market from time to time in order to meet short-term working capital needs and to retire other debt obligations.  At March 31, 2014, the Company had $374 million in commercial paper outstanding compared to no commercial paper outstanding at December 31, 2013. The weighted average commercial paper outstanding for the three months endedMarch 31, 2014 was $204 million. The weighted average interest rate of the commercial paper outstanding for the three months endedMarch 31, 2014 was 0.32%.

10.  Income Taxes

The effective tax rate on net income was 18.9% and 26.1% for the quarters ended March 31, 2014 and 2013, respectively. The effective tax rate in the first quarter 2014 was favorably impacted by a change in the geographical distribution of income.

11.  Shareholders’ Equity

Ordinary Shares

In April 2012, the Company’s Board of Directors authorized a share repurchase program under which up to $5.0 billion of Class A Ordinary Shares may be repurchased (“2012 Share Repurchase Program”). Under this program, shares may be repurchased through the open market or in privately negotiated transactions, from time to time, based on prevailing market conditions, and will be funded from available capital.

During the three months ended March 31, 2014, the Company repurchased 7.2 million shares at an average price per share of $83.45 for a total cost of $600 million under the 2012 Share Repurchase Program. During the three months ended March 31, 2013, the Company repurchased 5.0 million shares at an average price per share of $59.82 for a total cost of $300 million under the 2012 Share Repurchase Program. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is $2.3 billion. Since the inception of the 2012 Share Repurchase Program, the Company repurchased a total of 43.5 million shares for an aggregate cost of $2.7 billion.

Participating Securities

Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid, are participating securities, as defined, and therefore, should be included in computing basic and diluted earnings per share using the two class method.  Certain of the Company’s restricted share awards allow the holder to receive a non-forfeitable dividend equivalent.

Net income attributable to participating securities was $3 million in both the three months ended March 31, 2014 and 2013.

Weighted average shares outstanding are as follows (in millions):

	Three months ended March 31,
	2014	2013
Shares for basic earnings per share (1)	303.5	316.4
Common stock equivalents	3.7	3.6
Shares for diluted earnings per share	307.2	320.0

   ______________________________________________

(1) Includes 3.4 million and 4.2 million of participating securities for the three months ended March 31, 2014 and 2013, respectively.

Certain ordinary share equivalents were not included in the computation of diluted net income per share because their inclusion would have been antidilutive. There were no shares excluded from the calculation for the three months ended March 31, 2014. The number of shares excluded from the calculation was 0.2 million for the three months ended March 31, 2013.

12

Accumulated Other Comprehensive Loss

Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):

	Change in Fair Value of Investments (1)		Change in Fair Value of Derivatives (1)			Foreign Currency Translation Adjustments		Post-Retirement Benefit Obligation (2)			Total
Balance at December 31, 2013	$	1	$	(22	)	$	169	$	(2,522	)	$	(2,374	)
Other comprehensive income (loss) before reclassifications, net	1		—			18		—			19
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	—		14			—		36			50
Tax benefit	—		(5		)	—		(10		)	(15		)
Amounts reclassified from accumulated other comprehensive loss, net	—		9			—		26			35
Net current period other comprehensive (loss) income	1		9			18		26			54
Balance at March 31, 2014	$	2	$	(13	)	$	187	$	(2,496	)	$	(2,320	)

______________________________________________

(1) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income

(2) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits

12.  Employee Benefits

The following table provides the components of the net periodic benefit cost for Aon’s material U.K., U.S., and other significant international pension plans, which are located in the Netherlands and Canada (in millions):

	Three months ended March 31,
	U.K.						U.S.						Other
	2014			2013			2014			2013			2014			2013
Service cost	$	—		$	—		$	—		$	—		$	—		$	5
Interest cost	58			53			32			28			12			11
Expected return on plan assets	(82		)	(75		)	(39		)	(34		)	(15		)	(15		)
Amortization of net actuarial loss	13			12			10			13			2			6
Net periodic (benefit) cost	(11		)	(10		)	3			7			(1		)	7
Curtailment loss (gain) and other	—			—			1			—			(3		)	—
Total net periodic benefit cost	$	(11	)	$	(10	)	$	4		$	7		$	(4	)	$	7

Based on current assumptions, in 2014, Aon plans to contribute $185 million, $173 million, and $27 million to its U.K., U.S., and other significant international pension plans, respectively. During the three months ended March 31, 2014, contributions of $65 million, $40 million, and $12 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.

13

13.  Share-Based Compensation Plans

The following table summarizes share-based compensation expense recognized in the Condensed Consolidated Statements of Income in Compensation and benefits (in millions):

	Three months ended March 31,
	2014		2013
Restricted share units (“RSUs”)	$	60	$	55
Performance share awards (“PSAs”)	39		11
Share options	—		1
Employee share purchase plans	3		2
Total share-based compensation expense	$	102	$	69

Restricted Share Units

A summary of the status of the Company’s RSUs is as follows (shares in thousands):

	Three months ended March 31,
	2014				2013
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	9,759		$	51	10,432		$	44
Granted	1,146		83		1,764		60
Vested	(1,950	)	51		(2,080	)	46
Forfeited	(125	)	50		(128	)	44
Non-vested at end of period	8,830		56		9,988		47

 ______________________________________________

(1) Represents per share weighted average fair value of award at date of grant.

Performance Share Awards

The vesting of PSAs is contingent upon meeting a level of earnings per share performance over a three-year period. The performance conditions are not considered in the determination of the grant date fair value for these awards. The fair value of PSAs is based upon the market price of an Aon ordinary share at the date of grant. Compensation expense is recognized over the performance period based on management's estimate of the number of units expected to vest. Compensation expense is adjusted to reflect the actual number of shares issued at the end of the programs. The actual issue of shares may range from 0-200% of the target number of PSAs granted, based on the terms of the plan and level of achievement of the related performance target. Dividend equivalents are not paid on PSAs.

Information as of March 31, 2014 regarding the Company’s target PSAs granted and shares that would be issued at current performance levels for PSAs granted during the three months ended March 31, 2014 and the years ended December 31, 2013 and 2012, respectively, is as follows (shares in thousands, dollars in millions, except fair value):

	As of March 31, 2014		As of December 31, 2013		As of December 31, 2012
Target PSAs granted	816		1,135		1,369
Fair value (1)	$	81	$	58	$	47
Number of shares that would be issued based on current performance levels	816		2,243		2,682
Unamortized expense, based on current performance levels	$	65	$	82	$	34

 ______________________________________________

(1) Represents per share weighted average fair value of award at date of grant.

Share Options

The Company did not grant any share options during the three months ended March 31, 2014 or 2013, respectively.

14

A summary of the status of the Company’s share options and related information is as follows (shares in thousands):

	Three months ended March 31,
	2014				2013
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Beginning outstanding	3,462		$	32	5,611		$	32
Granted	—		—		—		—
Exercised	(416	)	33		(610	)	31
Forfeited and expired	(2	)	36		(10	)	33
Outstanding at end of period	3,044		32		4,991		32
Exercisable at end of period	2,928		32		4,579		32

The weighted average remaining contractual life, in years, of outstanding options was 2.0 years and 2.5 years at March 31, 2014 and 2013, respectively.

The aggregate intrinsic value represents the total pretax intrinsic value, based on options with an exercise price less than the Company’s closing share price of $84.28 as of March 31, 2014, which would have been received by the option holders had those option holders exercised their options as of that date.  At March 31, 2014, the aggregate intrinsic value of options outstanding was $159 million, of which $154 million was exercisable.

Other information related to the Company’s share options is as follows (in millions):

	Three months ended March 31,
	2014		2013
Aggregate intrinsic value of stock options exercised	$	21	$	17
Cash received from the exercise of stock options	14		20
Tax benefit realized from the exercise of stock options	6		3

Unamortized deferred compensation expense, which includes both options and awards, amounted to $365 million as of March 31, 2014, with a remaining weighted-average amortization period of approximately 2.0 years.

14.  Derivatives and Hedging

The Company is exposed to market risks, including changes in foreign currency exchange rates and interest rates.  To manage the risk related to these exposures, the Company enters into various derivative instruments that reduce these risks by creating offsetting exposures.  The Company does not enter into derivative transactions for trading or speculative purposes.

Foreign Exchange Risk Management

The Company is exposed to foreign exchange risk when it receives revenues, pays expenses, or enters into intercompany loans denominated in a currency that differs from its functional currency, or other transactions that are denominated in a currency other than its functional currency.  The Company uses foreign exchange derivatives, typically forward contracts, options and cross currency swaps, to reduce its overall exposure to the effects of currency fluctuations on cash flows.  These exposures are hedged, on average, for less than two years; however, in limited instances, the Company has hedged certain exposures up to five years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to hedge its net investments in foreign operations for up to two years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to manage the currency exposure of the Company’s global liquidity profile, including monetary assets or liabilities that are denominated in a non-functional currency of an entity, for up to one year in the future. These derivatives are not accounted for as hedges, and changes in fair value are recorded each period in Other income in the Condensed Consolidated Statements of Income.

Interest Rate Risk Management

The Company holds variable-rate short-term brokerage and other operating deposits. The Company uses interest rate derivatives, typically swaps, to reduce its exposure to the effects of interest rate fluctuations on the forecasted interest receipts

15

from these deposits for up to two years in the future.

Certain derivatives also give rise to credit risks from the possible non-performance by counterparties.  The credit risk at the balance sheet date is generally limited to the fair value of those contracts that are favorable to the Company.  The Company has reduced its credit risk by using International Swaps and Derivatives Association (“ISDA”) master agreements, collateral and credit support arrangements, entering into non-exchange-traded derivatives with highly-rated major financial institutions and by using exchange-traded instruments.  The Company monitors the creditworthiness of, and exposure to, its counterparties.  As of March 31, 2014, all net derivative positions were free of credit risk contingent features.  The Company has not received or pledged any collateral related to derivative arrangements as of March 31, 2014.

The notional and fair values of derivative instruments are as follows (in millions):

	Notional Amount				Derivative Assets (1)				Derivative Liabilities (2)
	March 31, 2014		December 31, 2013		March 31, 2014		December 31, 2013		March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	172	$	171	$	9	$	9	$	—	$	—
Foreign exchange contracts	1,223		1,191		73		71		94		93
Total	1,395		1,362		82		80		94		93
Derivatives not accounted for as hedges:
Foreign exchange contracts	177		215		—		—		—		—
Total	$	1,572	$	1,577	$	82	$	80	$	94	$	93

______________________________________________

(1) Included within Other current assets ($49 million and $46 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($33 million and $34 million at March 31, 2014 and December 31, 2013, respectively)

(2) Included within Other current liabilities ($18 million and $51 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($76 million and $42 million at March 31, 2014 and December 31, 2013, respectively)

Offsetting of financial assets and derivatives assets are as follows (in millions):

	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Assets Presented in the Statement of Financial Position (1)
	March 31, 2014		December 31, 2013		March 31, 2014			December 31, 2013			March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	9	$	9	$	—		$	—		$	9	$	9
Foreign exchange contracts	73		71		(24		)	(30		)	49		41
Total	82		80		(24		)	(30		)	58		50
Derivatives not accounted for as hedges:
Foreign exchange contracts	—		—		—			—			—		—
Total	$	82	$	80	$	(24	)	$	(30	)	$	58	$	50

______________________________________________

(1) Included within Other current assets ($21 million and $18 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($37 million and $32 million at March 31, 2014 and December 31, 2013, respectively)

16

Offsetting of financial liabilities and derivative liabilities are as follows (in millions):

	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Liabilities Presented in the Statement of Financial Position (2)
	March 31, 2014		December 31, 2013		March 31, 2014			December 31, 2013			March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	—	$	—	$	—		$	—		$	—	$	—
Foreign exchange contracts	94		93		(24		)	(30		)	70		63
Total	94		93		(24		)	(30		)	70		63
Derivatives not accounted for as hedges:
Foreign exchange contracts	—		—		—			—			—		—
Total	$	94	$	93	$	(24	)	$	(30	)	$	70	$	63

______________________________________________

(2) Included within Other current liabilities ($18 million and $23 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($52 million and $40 million at March 31, 2014 and December 31, 2013, respectively)

The amounts of derivative gains (losses) recognized in the Condensed Consolidated Financial Statements for the three months endedMarch 31, 2014 and 2013 are as follows (in millions):

	Three months ended March 31,
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	2014			2013
Cash flow hedges:
Interest rate contracts (1)	$	—		$	—
Foreign exchange contracts (2)	(8		)	(29		)
Total	$	(8	)	$	(29	)
Foreign net investment hedges:
Foreign exchange contracts	$	—		$	—

 ______________________________________________

(1) Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Interest Expense

(2) Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Compensation and benefits ($11 million and $4 million gain for the three months ended March 31, 2014 and 2013, respectively), and Other income ($19 million and $33 million loss for the three months ended March 31, 2014 and 2013, respectively)

Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	Three months ended March 31,
	2014			2013
Cash flow hedges:
Interest rate contracts (1)	$	—		$	—
Foreign exchange contracts (2)	(21		)	(11		)
Total	(21		)	(11		)
Foreign net investment hedges:
Foreign exchange contracts	$	—		$	—

 ______________________________________________

(1) Included within Interest Expense

(2) Included within Compensation and benefits ($3 million and $1 million loss for the three months ended March 31, 2014 and 2013, respectively), Other general expenses ($1 million loss for the three months ended March 31, 2013), and Other income ($18 million and $9 million loss for the three months ended March 31, 2014 and 2013, respectively)

17

The amount of gain (loss) recognized in the Condensed Consolidated Financial Statements is as follows (in millions):

	Three months ended March 31,
	Amount of Gain (Loss) Recognized in Income on Derivative (2)					Amount of Gain (Loss) Recognized in Income on Related Hedged Item
	2014		2013			2014		2013
Fair value hedges:
Foreign exchange contracts (1)	$	—	$	(1	)	$	—	$	1

  ______________________________________________

(1) Relates to fixed rate debt

(2) Included in Interest expense

The Company estimates that approximately $15 million of pretax losses currently included within Accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

The amount of gain (loss) recognized in income on the ineffective portion of derivatives for the three months endedMarch 31, 2014 and 2013 was not material.

During the three months endedMarch 31, 2014 and 2013, the Company recorded a loss of $5 million and $9 million, respectively, in Other income for foreign exchange derivatives not designated or qualifying as hedges.

15.  Fair Value Measurements and Financial Instruments

Accounting standards establish a three tier fair value hierarchy that prioritizes the inputs used in measuring fair values as follows:

• Level 1 — observable inputs such as quoted prices for identical assets in active markets;

• Level 2 — inputs other than quoted prices for identical assets in active markets, that are observable either directly or indirectly; and

• Level 3 — unobservable inputs in which there is little or no market data which requires the use of valuation techniques and the development of assumptions.

The following methods and assumptions are used to estimate the fair values of the Company’s financial instruments:

Money market funds and highly liquid debt securities are carried at cost and amortized cost, respectively, as an approximation of fair value. Based on market convention, the Company considers cost a practical and expedient measure of fair value.

Cash, cash equivalents, and highly liquid debt instruments consist of cash and institutional short-term investment funds. The Company independently reviews the short-term investment funds to obtain reasonable assurance the fund net asset value is $1 per share.

Equity investments consist of domestic and international equity securities and exchange traded equity derivatives valued using the closing stock price on a national securities exchange. Over the counter equity derivatives are valued using observable inputs such as underlying prices of the equity security and volatility. The Company independently reviews the listing of Level 1 equity securities in the portfolio and agrees the closing stock prices to a national securities exchange, and on a sample basis, independently verifies the observable inputs for Level 2 equity derivatives and securities.

Fixed income investments consist of certain categories of bonds and derivatives. Corporate, government, and agency bonds are valued by pricing vendors who estimate fair value using recently executed transactions and proprietary models based on observable inputs, such as interest rate spreads, yield curves and credit risk. Asset-backed securities are valued by pricing vendors who estimate fair value using discounted cash flow models utilizing observable inputs based on trade and quote activity of securities with similar features. Fixed income derivatives are valued by pricing vendors using observable inputs such as interest rates and yield curves. The Company obtains a detailed understanding of the models, inputs, and assumptions used in developing prices provided by its vendors. This understanding includes discussions with valuation resources at the vendor. During these discussions, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply

18

with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the pricing vendor and independently verifies the observable inputs, as well as assesses assumptions used for reasonableness based on relevant market conditions and internal Company guidelines. If an assumption is deemed unreasonable, based on the Company’s guidelines, it is then reviewed by a member of management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates used in the Condensed Consolidated Financial Statements.

Pooled funds consist of various equity, fixed income, commodity, and real estate mutual fund type investment vehicles. Pooled investment funds fair value is estimated based on the proportionate share ownership in the underlying net assets of the investment, which is based on the fair value of the underlying securities that trade on a national securities exchange. Where possible, the Company independently reviews the listing securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the fund and discusses fund performance with pooled fund managers. The Company obtains audited fund manager financial statements, when available. If the pooled fund is designed to replicate a publicly traded index, the Company compares the performance of the fund to the index to assess the reasonableness of the fair value measurement.

Alternative investments consist of limited partnerships, private equity and hedge funds. Alternative investment fair value is generally estimated based on the proportionate share ownership in the underlying net assets of the investment as determined by the general partner or investment manager. The valuations are based on various factors depending on investment strategy, proprietary models, and specific financial data or projections. The Company obtains audited fund manager financial statements, when available. The Company obtains a detailed understanding of the models, inputs and assumptions used in developing prices provided by the investment managers (or appropriate party) through regular discussions. During these discussions with the investment managers, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the investment manager and independently verifies the observable inputs, as well as assesses assumptions used for reasonableness based on relevant market conditions and internal Company guidelines. If an assumption is deemed unreasonable, based on the Company’s guidelines, it is then reviewed by a member of management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates in the Condensed Consolidated Financial Statements.

Derivatives are carried at fair value, based upon industry standard valuation techniques that use, where possible, current market-based or independently sourced pricing inputs, such as interest rates, currency exchange rates, or implied volatilities.

Annuity contracts consist of insurance group annuity contracts purchased to match the pension benefit payment stream owed to certain selected plan participant demographics within a few major United Kingdom defined benefit plans. Annuity contracts are valued using a discounted cash flow model utilizing assumptions such as discount rate, mortality, and inflation. The Company independently verifies the observable inputs.

Real estate and REITs consist of publicly traded real estate investment trusts ("REITs") and direct real estate investments. Level 1 REITs are valued using the closing stock price on a national securities exchange. The Level 3 values are based on the proportionate share of ownership in the underlying net asset value as determined by the investment manager. The Company independently reviews the listing of Level 1 REIT securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the Level 3 real estate funds and discusses performance with the fund managers. The Company obtains audited fund manager financial statements, when available. See the description of “Alternative investments” for further detail on valuation procedures surrounding Level 3 REITs.

Guarantees are carried at fair value, which is based on discounted estimated cash flows using published historical cumulative default rates and discount rates commensurate with the underlying exposure.

Debt is carried at outstanding principal balance, less any unamortized discount or premium. Fair value is based on quoted market prices or estimates using discounted cash flow analyses based on current borrowing rates for similar types of borrowing arrangements.

19

The following tables present the categorization of the Company’s assets and liabilities that are measured at fair value on a recurring basis at March 31, 2014 and December 31, 2013 (in millions):

			Fair Value Measurements Using
	Balance at March 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds and highly liquid debt securities (1)	$	2,086	$	2,061	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	1		—		—		1
Government bonds	7		—		7		—
Equity securities	15		6		9		—
Derivatives:
Interest rate contracts	9		—		9		—
Foreign exchange contracts	73		—		73		—
Liabilities:
Derivatives:
Foreign exchange contracts	94		—		94		—

  ______________________________________________

(1) Includes $2,061 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

			Fair Value Measurements Using
	Balance at December 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds and highly liquid debt securities (1)	$	2,079	$	2,054	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	2		—		—		2
Government bonds	7		—		7		—
Equity securities	13		6		7		—
Derivatives:
Interest rate contracts	9		—		9		—
Foreign exchange contracts	71		—		71		—
Liabilities:
Derivatives:
Foreign exchange contracts	93		—		93		—

  ______________________________________________

(1)  Includes $2,054 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

There were no transfers of assets or liabilities between fair value hierarchy levels in the three months endedMarch 31, 2014 and 2013, respectively. There were no realized or unrealized gains or losses recognized in the Condensed Consolidated Statements of Income during either the three months ended March 31, 2014 or 2013, related to assets and liabilities measured at fair value using unobservable inputs.

20

The fair value of Long-term debt is classified as Level 2 of the fair value hierarchy. The following table discloses the Company’s financial instruments where the carrying amounts and fair values differ (in millions):

	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	3,669	$	3,966	$	3,686	$	3,894

16.  Commitments and Contingencies

Legal

Aon and its subsidiaries are subject to numerous claims, tax assessments, lawsuits and proceedings that arise in the ordinary course of business, which frequently include errors and omissions (“E&O”) claims. The damages claimed in these matters are or may be substantial, including, in many instances, claims for punitive, treble or extraordinary damages. Aon has historically purchased E&O insurance and other insurance to provide protection against certain losses that arise in such matters. Aon has exhausted or materially depleted its coverage under some of the policies that protect the Company and, consequently, is self-insured or materially self-insured for some historical claims. Accruals for these exposures and legal fees, and related insurance receivables, when applicable, have been provided to the extent that losses are deemed probable and are reasonably estimable. These amounts are adjusted from time to time as developments warrant. Amounts related to settlement provisions are recorded in Other general expenses in the Condensed Consolidated Statements of Income.

A retail insurance brokerage subsidiary of Aon provides insurance brokerage services to Northrop Grumman Corporation (“Northrop”). This Aon subsidiary placed Northrop’s excess property insurance program for the period covering 2005. Northrop suffered a substantial loss in August 2005 when Hurricane Katrina damaged Northrop’s facilities in the Gulf states. Northrop’s excess insurance carrier, Factory Mutual Insurance Company (“Factory Mutual”), denied coverage for the claim pursuant to a flood exclusion. Northrop sued Factory Mutual in the United States District Court for the Central District of California and later sought to add this Aon subsidiary as a defendant, asserting that if Northrop’s policy with Factory Mutual does not cover the losses suffered by Northrop stemming from Hurricane Katrina, then this Aon subsidiary will be responsible for Northrop’s losses. On August 26, 2010, the court granted in large part Factory Mutual’s motion for partial summary judgment regarding the applicability of the flood exclusion and denied Northrop’s motion to add this Aon subsidiary as a defendant in the federal lawsuit. On January 27, 2011, Northrop filed suit against this Aon subsidiary in state court in Los Angeles, California, pleading claims for negligence, breach of contract and negligent misrepresentation. Northrop has since settled with Factory Mutual. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Another retail insurance brokerage subsidiary of Aon has been sued in Tennessee state court by a client, Opry Mills Mall Limited Partnership (“Opry Mills”) that sustained flood damage to its property in May 2010. The lawsuit seeks $200 million from numerous insurers with whom this Aon subsidiary placed the client’s property insurance coverage. The insurers contend that only $50 million in coverage is available for the loss because the flood event occurred on property in a high hazard flood zone. Opry Mills is seeking full coverage from the insurers for the loss and has sued this Aon subsidiary in the alternative for the same $150 million difference on various theories of professional liability if the court determines there is not full coverage. In addition, Opry Mills seeks prejudgment interest, attorneys' fees and enhanced damages which could substantially increase Aon's exposure. Aon believes it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

A pensions consulting and administration subsidiary of Hewitt before its acquisition by Aon provided advisory services to the Trustees of the Philips UK pension fund and the relevant employer of fund beneficiaries (together, “Philips”). In January 2014, the Aon subsidiary was served with a High Court lawsuit alleging negligence and breach of duty. The proceedings assert Philips' right to claim damages related to Philips' use of a credit default swap hedging strategy pursuant to the supply of the advisory services, which is said to have resulted in substantial damages to Philips. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Mazeikiu Nafta ("MN"), which operates an oil refinery in Lithuania, has sued an insurance brokerage subsidiary of Aon in London. Aon placed property damage and business interruption coverage for MN. There was a fire at the refinery in 2006. MN settled with insurers in November 2011 and claimed against Aon in December 2012. The claim is for $125 million, which is the shortfall alleged by MN to have been caused by Aon's failure to obtain appropriate business interruption coverage. Aon

21

believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

The International Road Transport Union ("IRU") sued Aon in a court in Switzerland. IRU alleges, among other things, that, between 1995 and 2004, a predecessor of Aon and, later, an Aon subsidiary (1) accepted commissions for certain insurance placements that violated a fee agreement entered between the parties and (2) negligently failed to ask certain insurance carriers to contribute to the IRU's risk management costs.  Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims.  The outcome of these proceedings, and the amount of any losses or other payments that may result, cannot be estimated at this time.

AXA Versicherung Aktiengesellschaft ("AXA") started arbitral proceedings against an insurance and reinsurance brokerage subsidiary of Aon in Germany.  Predecessors of AXA granted predecessors of the Aon subsidiary a mandate to underwrite non-proportional reinsurance business from 1975 through 1999. AXA alleges, among other things, that the Aon-related entities intentionally exceeded their mandate and that, if AXA had known of this intention, it would not have granted a mandate.  Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims.  The outcome of these proceedings, and the amount of any losses or other payments that may result, cannot be estimated at this time.

From time to time, Aon’s clients may bring claims and take legal action pertaining to the performance of fiduciary responsibilities. Whether client claims and legal action related to the Company’s performance of fiduciary responsibilities are founded or unfounded, if such claims and legal actions are resolved in a manner unfavorable to the Company, they may adversely affect Aon’s financial results and materially impair the market perception of the Company and that of its products and services.

Although the ultimate outcome of all matters referred to above cannot be ascertained, and liabilities in indeterminate amounts may be imposed on Aon or its subsidiaries, on the basis of present information, amounts already provided, availability of insurance coverages and legal advice received, it is the opinion of management that the disposition or ultimate determination of such claims will not have a material adverse effect on the consolidated financial position of Aon. However, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by an unfavorable resolution of these matters.

Guarantees and Indemnifications

In connection with the redomicile of Aon's headquarters ("the Redomestication"), the Company on April 2, 2012 entered various agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under issued and outstanding debt securities. Those agreements included the (1) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc, and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”) (amending and restating the Indenture, dated as of September 10, 2010, between Aon Corporation and the Trustee), (2) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of December 16, 2002, between Aon Corporation and the Trustee), (3) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of January 13, 1997, as supplemented by the First Supplemental Indenture, dated as of January 13, 1997) (4) First Supplemental Indenture, dated as of April 2, 2012, among Aon Finance N.S. 1, ULC, as issuer, Aon Corporation, as guarantor, Aon plc, as guarantor, and Computershare Trust Company of Canada, as trustee, and (5) Amended and Restated Trust Deed, among Aon Corporation, Aon plc, Aon Services Luxembourg & Co S.C.A. (formerly known as Aon Financial Services Luxembourg S.A.) (“Aon Luxembourg”) and BNY Mellon Corporate Trustee Services Limited, as trustee (the “Luxembourg Trustee”) (amending and restating the Trust Deed, dated as of July 1, 2009, as amended and restated on January 12, 2011, among Aon Delaware, Aon Luxembourg and the Luxembourg Trustee).

Effective as of the same date, the Company also entered into agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under the (1) $450,000,000 Term Credit Agreement dated June 15, 2011, among Aon Corporation, as borrower, Bank of America, N.A., as administrative agent and the other agents and lenders party thereto, (2) $400,000,000Five-Year Agreement dated March 20, 2012, among Aon Corporation, as borrower, Citibank, N.A., as administrative agent and the other agents and lenders party thereto and (3) €650,000,000 Facility Agreement, dated October 15, 2010, among Aon Corporation, the subsidiaries of Aon Corporation party thereto as borrowers, Citibank International plc, as agent, and the other agents and lenders party thereto, as amended on July 18, 2011.

The Company provides a variety of guarantees and indemnifications to its customers and others. The maximum potential amount of future payments represents the notional amounts that could become payable under the guarantees and indemnifications if there were a total default by the guaranteed parties, without consideration of possible recoveries under

22

recourse provisions or other methods. These amounts may bear no relationship to the expected future payments, if any, for these guarantees and indemnifications. Any anticipated amounts payable are included in the Company’s Condensed Consolidated Financial Statements, and are recorded at fair value.

The Company expects that, as prudent business interests dictate, additional guarantees and indemnifications may be issued from time to time.

Letters of Credit

The Company had total letters of credit (“LOCs”) outstanding for approximately $66 million at March 31, 2014, compared to $71 million at December 31, 2013. These letters of credit cover the beneficiaries related to certain of Aon’s U.S. and Canadian non-qualified pension plan schemes and secure deductible retentions for Aon’s own workers compensation program. The Company has also issued LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at its international subsidiaries. Amounts are accrued in the Condensed Consolidated Financial Statements, and are recorded at fair value.

Commitments

The Company has provided commitments to fund certain limited partnerships in which it has an interest in the event that the general partners request funding. Some of these commitments have specific expiration dates and the maximum potential funding under these commitments was $24 million at March 31, 2014 compared to $34 million at December 31, 2013. During the three months endedMarch 31, 2014, the Company funded $10 million of these commitments.

Premium Payments

The Company has certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies. Costs associated with these guarantees, to the extent estimable and probable, are provided in Aon’s allowance for doubtful accounts. The maximum exposure with respect to such contractual contingent guarantees was approximately $64 million at March 31, 2014 compared to $98 million at December 31, 2013.

17. Segment Information

The Company has two reportable segments:  Risk Solutions and HR Solutions.  Unallocated income and expenses, when combined with the operating segments and after the elimination of intersegment revenues and expenses, equal the amounts in the Condensed Consolidated Financial Statements.

Reportable operating segments have been determined using a management approach, which is consistent with the basis and manner in which Aon’s chief operating decision-maker (“CODM”) uses financial information for the purposes of allocating resources and evaluating performance.  The CODM assesses performance based on operating income and generally accounts for inter-segment revenue as if the revenue were from third parties and at what management believes are current market prices.  The Company does not present net assets by segment as this information is not reviewed by the CODM.

Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through Aon’s global distribution network.

HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies.

Aon’s total revenue is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	1,994		$	1,971
HR Solutions	965			954
Intersegment eliminations	(12		)	(10		)
Total revenue	$	2,947		$	2,915

23

Commissions, fees and other revenues by product are as follows (in millions):

	Three months ended March 31,
	2014			2013
Retail brokerage	$	1,579		$	1,562
Reinsurance brokerage	409			402
Total Risk Solutions Segment	1,988			1,964
Consulting services	384			382
Outsourcing	589			581
Intrasegment	(8		)	(9		)
Total HR Solutions Segment	965			954
Intersegment	(12		)	(10		)
Total commissions, fees and other revenue	$	2,941		$	2,908

Fiduciary investment income by segment is as follows (in millions):

	Three months ended March 31,
	2014		2013
Risk Solutions	$	6	$	7
HR Solutions	—		—
Total fiduciary investment income	$	6	$	7

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	445		$	403
HR Solutions	67			51
Segment income before income taxes	512			454
Unallocated expenses	(43		)	(44		)
Interest income	2			1
Interest expense	(58		)	(52		)
Other income	1			9
Income before income taxes	$	414		$	368

Unallocated expenses include administrative or other costs not attributable to the operating segments, such as corporate governance costs. Interest income represents income earned primarily on operating cash balances and certain income producing securities. Interest expense represents the cost of debt obligations.

Other income consists of equity earnings, realized gains or losses on the sale of investments, gains or losses on the disposal of businesses, gains or losses on derivatives, and gains or losses on foreign currency transactions.

18.  Guarantee of Registered Securities

As described in Note 16, in connection with the Redomestication, Aon plc entered into various agreements pursuant to which it agreed to guarantee the obligations of Aon Corporation arising under issued and outstanding debt securities. Aon Corporation is a 100% directly owned subsidiary of Aon plc. The debt securities that are subject to Rule 3-10 of Regulation S-X are the 3.50% senior notes due September 2015, the 3.125% senior notes due May 2016, the 5.00% senior notes due September 2020, the 8.205% junior subordinated deferrable interest debentures due January 2027 and the 6.25% senior notes due September 2040. All guarantees of Aon plc are full and unconditional. There are no other subsidiaries of Aon plc that are guarantors of the debt.

Aon Corporation entered into an agreement pursuant to which it agreed to guarantee the obligations of Aon plc arising under the 4.250% Notes Due 2042 exchanged for Aon Corporation's outstanding 8.205% junior subordinated deferrable interest debentures due January 2027 in both Original Notes and Exchange Notes form. Those notes are subject to Rule 3-10 of Regulation S-X. Aon Corporation also agreed to guarantee the obligations of Aon plc arising under the 4.45% Notes Due 2043 issued on May 21, 2013 and the 4.00% Notes Due November 2023 issued on November 21, 2013. In each case, the guarantee

24

of Aon Corporation is full and unconditional. There are no subsidiaries of Aon plc, other than Aon Corporation, that are guarantors of the 4.250% Notes Due 2042, the 4.45% Notes Due 2043 or the 4.00% Notes Due 2023.

The following tables set forth condensed consolidating statements of income for the three months endedMarch 31, 2014 and 2013, condensed consolidating statements of comprehensive income for the three months endedMarch 31, 2014 and 2013, condensed consolidating statements of financial position as of March 31, 2014 and December 31, 2013, and condensed consolidating statements of cash flows for the three months ended March 31, 2014 and 2013 in accordance with Rule 3-10 of Regulation S-X. The condensed consolidating financial information includes the accounts of Aon plc, the accounts of Aon Corporation, and the combined accounts of the non-guarantor subsidiaries. The condensed consolidating financial statements are presented in all periods as a merger under common control, with Aon plc presented as the parent company in all periods prior and subsequent to the Redomestication. The principal consolidating adjustments are to eliminate the investment in subsidiaries and intercompany balances and transactions.

In July 2013, Aon Holdings LLC, an intermediate holding company and the then-direct parent of Aon Corporation, transferred its ownership of Aon Corporation to Aon plc via distribution. The financial results of Aon Holdings LLC were included in the Other Non-Guarantor Subsidiaries column of the Condensed Consolidating Financial Statements. The Company has reflected the transfer of Aon Corporation from Aon Holdings LLC to Aon plc below for all periods presented.

Condensed Consolidating Statement of Income

	Three months ended March 31, 2014
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,940		$	—		$	2,941
Fiduciary investment income	—			—			6			—			6
Total revenue	1			—			2,946			—			2,947
Expenses
Compensation and benefits	12			8			1,731			—			1,751
Other general expenses	7			17			703			—			727
Total operating expenses	19			25			2,434			—			2,478
Operating (loss) income	(18		)	(25		)	512			—			469
Interest income	(2		)	—			4			—			2
Interest expense	(9		)	(31		)	(18		)	—			(58		)
Intercompany interest income (expense)	111			(74		)	(37		)	—			—
Other income	—			—			1			—			1
Income (loss) before taxes	82			(130		)	462			—			414
Income tax (benefit) expense	20			(50		)	108			—			78
Income (loss) before equity in earnings of subsidiaries	62			(80		)	354			—			336
Equity in earnings of subsidiaries, net of tax	263			280			—			(543		)	—
Net income	325			200			354			(543		)	336
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	325		$	200		$	343		$	(543	)	$	325

25

Condensed Consolidating Statement of Income

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,907		$	—		$	2,908
Fiduciary investment income	—			—			7			—			7
Total revenue	1			—			2,914			—			2,915
Expenses
Compensation and benefits	11			15			1,699			—			1,725
Other general expenses	7			6			767			—			780
Total operating expenses	18			21			2,466			—			2,505
Operating (loss) income	(17		)	(21		)	448			—			410
Interest income	—			1			—			—			1
Interest expense	(2		)	(34		)	(16		)	—			(52		)
Intercompany interest (expense) income	(7		)	43			(36		)	—			—
Other (expense) income	—			(1		)	10			—			9
(Loss) income before taxes	(26		)	(12		)	406			—			368
Income tax (benefit) expense	(5		)	(5		)	106			—			96
(Loss) income before equity in earnings of subsidiaries	(21		)	(7		)	300			—			272
Equity in earnings of subsidiaries, net of tax	282			254			—			(536		)	—
Net income	261			247			300			(536		)	272
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	261		$	247		$	289		$	(536	)	$	261

26

Condensed Consolidating Statement of Comprehensive Income

	Three months ended March 31, 2014
						Other
	Aon		Aon			Non-Guarantor			Consolidating
(millions)	plc		Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	325	$	200		$	354		$	(543	)	$	336
Less: Net income attributable to noncontrolling interests	—		—			11			—			11
Net income attributable to Aon shareholders	$	325	$	200		$	343		$	(543	)	$	325
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—		—			1			—			1
Change in fair value of derivatives	—		1			8			—			9
Foreign currency translation adjustments	—		(17		)	33			—			16
Post-retirement benefit obligation	—		6			20			—			26
Total other comprehensive income	—		(10		)	62			—			52
Equity in other comprehensive loss of subsidiaries, net of tax	54		69			—			(123		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—			(2		)	—			(2		)
Total other comprehensive income attributable to Aon shareholders	54		59			64			(123		)	54
Comprehensive income attributable to Aon shareholders	$	379	$	259		$	407		$	(666	)	$	379

Condensed Consolidating Statement of Comprehensive Income

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	261		$	247		$	300		$	(536	)	$	272
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	261		$	247		$	289		$	(536	)	$	261
Other comprehensive income (loss), net of tax:
Change in fair value of investments	—			—			—			—			—
Change in fair value of derivatives	—			1			(15		)	—			(14		)
Foreign currency translation adjustments	—			(8		)	(166		)	—			(174		)
Post-retirement benefit obligation	—			7			16			—			23
Total other comprehensive income	—			—			(165		)	—			(165		)
Equity in other comprehensive income of subsidiaries, net of tax	(165		)	(164		)	—			329			—
Less: Other comprehensive income attributable to noncontrolling interests	—			—			—			—			—
Total other comprehensive income attributable to Aon shareholders	(165		)	(164		)	(165		)	329			(165		)
Comprehensive income attributable to Aon Shareholders	$	96		$	83		$	124		$	(207	)	$	96

27

Condensed Consolidating Statement of Financial Position

	As of March 31, 2014
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	—	$	154	$	1,372	$	(1,188	)	$	338
Short-term investments	—		101		239		—			340
Receivables, net	—		1		2,879		—			2,880
Fiduciary assets	—		—		12,038		—			12,038
Intercompany receivables	116		3,982		5,878		(9,976		)	—
Other current assets	—		109		538		(70		)	577
Total Current Assets	116		4,347		22,944		(11,234		)	16,173
Goodwill	—		—		9,030		—			9,030
Intangible assets, net	—		—		2,500		—			2,500
Fixed assets, net	—		—		785		—			785
Investments	—		69		74		—			143
Intercompany receivables	7,166		2,163		2,201		(11,530		)	—
Other non-current assets	146		509		1,477		(686		)	1,446
Investment in subsidiary	4,979		12,165		—		(17,144		)	—
TOTAL ASSETS	$	12,407	$	19,253	$	39,011	$	(40,594	)	$	30,077
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	12,038	$	—		$	12,038
Short-term debt and current portion of long-term debt	227		140		710		—			1,077
Accounts payable and accrued liabilities	1,218		41		1,428		(1,188		)	1,499
Intercompany payables	87		5,834		4,055		(9,976		)	—
Other current liabilities	33		47		957		(70		)	967
Total Current Liabilities	1,565		6,062		19,188		(11,234		)	15,581
Long-term debt	792		2,516		361		—			3,669
Pension, other post-retirement and other post-employment liabilities	—		930		643		—			1,573
Intercompany payables	2,100		7,267		2,163		(11,530		)	—
Other non-current liabilities	4		112		1,818		(686		)	1,248
TOTAL LIABILITIES	4,461		16,887		24,173		(23,450		)	22,071
TOTAL AON SHAREHOLDERS’ EQUITY	7,946		2,366		14,778		(17,144		)	7,946
Noncontrolling interests	—		—		60		—			60
TOTAL EQUITY	7,946		2,366		14,838		(17,144		)	8,006
TOTAL LIABILITIES AND EQUITY	$	12,407	$	19,253	$	39,011	$	(40,594	)	$	30,077

28

Condensed Consolidating Statement of Financial Position

	As of December 31, 2013
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	—	$	247	$	1,246	$	(1,016	)	$	477
Short-term investments	—		163		360		—			523
Receivables, net	—		4		2,892		—			2,896
Fiduciary assets	—		—		11,871		—			11,871
Intercompany receivables	186		3,503		5,452		(9,141		)	—
Other current assets	—		69		513		(19		)	563
Total Current Assets	186		3,986		22,334		(10,176		)	16,330
Goodwill	—		—		8,997		—			8,997
Intangible assets, net	—		—		2,578		—			2,578
Fixed assets, net	—		—		791		—			791
Investments	—		57		75		—			132
Intercompany receivables	7,166		2,178		2,201		(11,545		)	—
Other non-current assets	146		560		1,421		(704		)	1,423
Investment in subsidiary	4,607		11,694		—		(16,301		)	—
TOTAL ASSETS	$	12,105	$	18,475	$	38,397	$	(38,726	)	$	30,251
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	11,871	$	—		$	11,871
Short-term debt and current portion of long-term debt	—		—		707		(4		)	703
Accounts payable and accrued liabilities	1,036		62		1,849		(1,016		)	1,931
Intercompany payables	15		5,449		3,677		(9,141		)	—
Other current liabilities	12		47		866		(19		)	906
Total Current Liabilities	1,063		5,558		18,970		(10,180		)	15,411
Long-term debt	792		2,512		378		4			3,686
Pension, other post-retirement and other post-employment liabilities	—		925		682		—			1,607
Intercompany payables	2,100		7,267		2,178		(11,545		)	—
Other non-current liabilities	5		159		1,892		(704		)	1,352
TOTAL LIABILITIES	3,960		16,421		24,100		(22,425		)	22,056
TOTAL AON SHAREHOLDERS’ EQUITY	8,145		2,054		14,247		(16,301		)	8,145
Noncontrolling interests	—		—		50		—			50
TOTAL EQUITY	8,145		2,054		14,297		(16,301		)	8,195
TOTAL LIABILITIES AND EQUITY	$	12,105	$	18,475	$	38,397	$	(38,726	)	$	30,251

29

Condensed Consolidating Statement of Cash Flows

	Three months ended March 31, 2014
	Aon			Aon			Other Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	89		$	(123	)	$	23		$	—		$	(11	)
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			37			5			—			42
Purchase of long-term investments	—			(10		)	—			—			(10		)
Net sales of short-term investments - non-fiduciary	—			62			121			—			183
Acquisition of businesses, net of cash acquired	—			—			(5		)	—			(5		)
Proceeds from sale of businesses	—			—			1			—			1
Capital expenditures	—			—			(55		)	—			(55		)
CASH PROVIDED BY INVESTING ACTIVITIES	—			89			67			—			156
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(600		)	—			—			—			(600		)
Advances from (to) affiliates	313			(206		)	65			(172		)	—
Issuance of shares for employee benefit plans	26			—			—			—			26
Issuance of debt	293			902			—			—			1,195
Repayment of debt	(68		)	(755		)	(6		)	—			(829		)
Cash dividends to shareholders	(53		)	—			—			—			(53		)
Purchase of shares from noncontrolling interests	—			—			1			—			1
Dividends paid to noncontrolling interests	—			—			—			—			—
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(89		)	(59		)	60			(172		)	(260		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			(24		)	—			(24		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	—			(93		)	126			(172		)	(139		)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	—			247			1,246			(1,016		)	477
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	154		$	1,372		$	(1,188	)	$	338

30

Condensed Consolidating Statement of Cash Flows

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	5		$	(23	)	$	72		$	—		$	54
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			1			17			—			18
Purchase of long-term investments	—			(3		)	—			—			(3		)
Net (purchases) sales of short-term investments - non-fiduciary	—			(39		)	23			—			(16		)
Acquisition of businesses, net of cash acquired	—			—			(2		)	—			(2		)
Proceeds from sale of businesses	—			—			1			—			1
Capital expenditures	—			—			(60		)	—			(60		)
CASH USED FOR INVESTING ACTIVITIES	—			(41		)	(21		)	—			(62		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(300		)	—			—			—			(300		)
Advances from (to) affiliates	96			(206		)	71			39			—
Issuance of shares for employee benefit plans	36			—			—			—			36
Issuance of debt	87			833			230			—			1,150
Repayment of debt	—			(511		)	(204		)	—			(715		)
Cash dividends to shareholders	(50		)	—			—			—			(50		)
Purchase of shares from noncontrolling interests	—			—			(1		)	—			(1		)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(131		)	116			96			39			120
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			5			—			5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(126		)	52			152			39			117
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	131			199			—			(39		)	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	5		$	251		$	152		$	—		$	408

31

Item 2.  Management’s Discussion and Analysis of Financial Condition and Results ofOperations

EXECUTIVE SUMMARY OF FIRST QUARTER 2014 FINANCIAL RESULTS

During the first three months of 2014, we continued to face certain headwinds impacting our business. In our Risk Solutions segment, these headwinds included economic weakness in continental Europe and a negative market impact in our Reinsurance business. In our HR Solutions segment, these headwinds included price compression in our benefits administration business and macro-economic pressures across continental Europe.

The following is a summary of our first quarter 2014 financial results:

• For the quarter, revenue increased $32 million, or 1%, to $2.9 billion compared to the prior year quarter due primarily to organic revenue growth of 2%, partially offset by a 1% unfavorable impact from foreign currency exchange rates and a $1 million, or 14%, decline in investment income due to lower average interest rates globally. In Risk Solutions, revenue was driven by solid growth in Retail brokerage across both the Americas and International businesses, as well as solid growth in our Reinsurance business. The HR Solutions segment had growth in investment and compensation consulting and modest growth in benefits administration and human resources business process outsourcing, partially offset by the unfavorable impact from the timing of revenue in the quarter.

• Operating expenses for the quarter were $2.5 billion, a decrease of $27 million, or 1%, compared to the prior year quarter of $2.5 billion due primarily to a $31 million increase in savings related to restructuring programs, a $26 million decrease in formal restructuring costs, an $18 million favorable impact from foreign currency exchange rates, a $17 million decrease in expenses related to acquisitions, net of divestitures, and a $13 million decrease in intangible asset amortization, partially offset by an increase in expense to support future growth in our health care exchange business and an increase in expense associated with organic revenue growth of 2%.

• Operating margin increased to 15.9% in the first quarter 2014 from 14.1% in the first quarter 2013. The increase in operating margin from the prior year quarter is primarily related to organic revenue growth of 2%, decreased intangible asset amortization, savings related to the restructuring programs, and expense discipline. Operating margin for Risk Solutions increased 190 basis points from 20.4% in the first quarter 2013 to 22.3% in the first quarter 2014, due primarily to solid revenue growth, expense discipline, and savings related to the restructuring programs. Operating margin for HR Solutions increased 160 basis points from 5.3% in the first quarter 2013 to 6.9% in the first quarter 2014, due primarily to modest revenue growth, a reduction in intangible asset amortization, and savings from the restructuring plans, partially offset by an increase in expense to support future growth in our healthcare exchange business and the unfavorable impact from timing of certain consulting revenue.

• Net income attributable to Aon shareholders increased$64 million, or 25%, to $325 million for the first quarter 2014 compared to the first quarter 2013.

• Cash flow used for operating activities was $11 million for the first quarter 2014, a decrease of $65 million, or 120%, from cash flow provided by operating activities of $54 million in the first quarter 2013 driven by expenses associated with organic growth and the unfavorable timing of certain incentive compensation and interest expense payments, partially offset by a solid underlying working capital performance and a decrease in both pension contributions and cash taxes in the quarter.

We focus on four key non-GAAP metrics each quarter that we communicate to shareholders: grow organically, expand adjusted margins, increase adjusted diluted earnings per share, and increase free cash flow.  The following is our measure of performance against these four metrics for the first quarter of 2014:

• Organic revenue growth, a non-GAAP measure as defined under the caption “Review of Consolidated Results — Organic Revenue,” was 2% in the first quarter 2014 unchanged from the prior year first quarter organic revenue growth of 2%. In Risk Solutions, revenue was driven by solid growth in Retail brokerage across both the Americas and International businesses, as well as solid growth in our Reinsurance business. The HR Solutions segment had growth in investment and compensation consulting and modest growth in benefits administration and human resources business process outsourcing, partially offset by the unfavorable impact from the timing of revenue in the quarter.

• Adjusted operating margin, a non-GAAP measure as defined under the caption “Review of Consolidated Results — Adjusted Operating Margin,” for the first quarter 2014 was 18.8% for Aon overall, 23.6% for the Risk Solutions segment, and 13.3% for the HR Solutions segment.  Adjusted operating margin was 18.5% for Aon overall, 22.5% for

32

the Risk Solutions segment, and 14.3% for the HR Solutions segment for the first quarter 2013.  The quarter-to-date increase in adjusted operating margin for the Risk Solutions segment reflects organic revenue growth, expense discipline, and savings related to the restructuring programs. The quarter-to-date decrease in adjusted operating margin for the HR Solutions segment reflects an increase in expense to support future growth in our health care exchange business and the unfavorable impact from timing of certain consulting revenue, partially offset by modest organic revenue growth and savings related to the Aon Hewitt restructuring program.

• Adjusted diluted earnings per share from net income attributable to Aon’s shareholders, a non-GAAP measure as defined under the caption “Review of Consolidated Results — Adjusted Diluted Earnings per Share,” was $1.28 per share in the first quarter of 2014 compared to $1.11 per share in the first quarter of 2013.

• Free cash flow, a non-GAAP measure as defined under the "Review of Consolidated Results Free Cash Flow," decreased$60 million from the prior year period to a use of cash of $66 million in the first quarter of 2014 driven by a decrease in cash flow from operations, partially offset by a decrease of $5 million in capital expenditures from the prior year period.

REVIEW OF CONSOLIDATED RESULTS

General

In our discussion of operating results, we sometimes refer to certain non-GAAP supplemental information derived from consolidated financial information specifically related to organic revenue growth, adjusted operating margin, adjusted diluted earnings per share, free cash flow, and the impact of foreign exchange rate fluctuations on operating results.

Organic Revenue

We use supplemental information related to organic revenue to help us and our investors evaluate business growth from existing operations.  Organic revenue is a non-GAAP measure and excludes the impact of foreign exchange rate changes, acquisitions, divestitures, transfers between business units, fiduciary investment income, reimbursable expenses, and certain unusual items.  Supplemental information related to organic revenue growth represents a measure not in accordance with U.S. GAAP, and should be viewed in addition to, not instead of, our Condensed Consolidated Financial Statements and Notes thereto.  Industry peers provide similar supplemental information about their revenue performance, although they may not make identical adjustments.  Reconciliations of this non-GAAP measure, organic revenue growth percentages, to the reported Commissions, fees and other revenue growth percentages, have been provided under the “Review by Segment” caption, below.

Adjusted Operating Margin

We use adjusted operating margin as a non-GAAP measure of core operating performance of our Risk Solutions and HR Solutions segments.  Adjusted operating margin excludes the impact of certain items, including restructuring charges, intangible asset amortization and headquarters relocation costs. This supplemental information related to adjusted operating margin represents a measure not in accordance with U.S. GAAP, and should be viewed in addition to, not instead of, our Condensed Consolidated Financial Statements and Notes thereto.

 A reconciliation of this non-GAAP measure to the reported operating margin is as follows (in millions):

	Three months ended March 31, 2014
	Total Aon (1)			Risk Solutions			HR Solutions
Revenue — U.S. GAAP	$	2,947		$	1,994		$	965
Operating income — U.S. GAAP	$	469		$	445		$	67
Intangible asset amortization	86			25			61
Operating income — as adjusted	$	555		$	470		$	128
Operating margins — U.S. GAAP	15.9		%	22.3		%	6.9		%
Operating margins — as adjusted	18.8		%	23.6		%	13.3		%

33

	Three months ended March 31, 2013
	Total Aon (1)			Risk Solutions			HR Solutions
Revenue — U.S. GAAP	$	2,915		$	1,971		$	954
Operating income — U.S. GAAP	$	410		$	403		$	51
Restructuring charges	26			11			15
Intangible asset amortization	99			29			70
Headquarters relocation costs	3			—			—
Operating income — as adjusted	$	538		$	443		$	136
Operating margins — U.S. GAAP	14.1		%	20.4		%	5.3		%
Operating margins — as adjusted	18.5		%	22.5		%	14.3		%

  ______________________________________________

(1) Includes unallocated expenses and the elimination of inter-segment revenue.

Adjusted Diluted Earnings per Share

We also use adjusted diluted earnings per share as a non-GAAP measure of our core operating performance. Adjusted diluted earnings per share excludes the impact of restructuring charges, intangible asset amortization and headquarters relocation costs, along with related income taxes. This supplemental information related to adjusted diluted earnings per share represents a measure not in accordance with U.S. GAAP and should be viewed in addition to, not instead of, our Condensed Consolidated Financial Statements and Notes thereto. Reconciliations of this non-GAAP measure to the reported diluted earnings per share are as follows (in millions except per share data): 

	Three months ended March 31, 2014
	U.S. GAAP			Adjustments		As Adjusted
Operating income	$	469		$	86	$	555
Interest income	2			—		2
Interest expense	(58		)	—		(58		)
Other income	1			—		1
Income before income taxes	414			86		500
Income taxes	78			17		95
Net income	336			69		405
Less: Net income attributable to noncontrolling interests	11			—		11
Net income attributable to Aon shareholders	$	325		$	69	$	394
Diluted earnings per share	$	1.06		$	0.22	$	1.28
Weighted average common shares outstanding — diluted	307.2			307.2		307.2

	Three months ended March 31, 2013
	U.S. GAAP			Adjustments		As Adjusted
Operating income	$	410		$	128	$	538
Interest income	1			—		1
Interest expense	(52		)	—		(52		)
Other income	9			—		9
Income before income taxes	368			128		496
Income taxes	96			33		129
Net income	272			95		367
Less: Net income attributable to noncontrolling interests	11			—		11
Net income attributable to Aon shareholders	$	261		$	95	$	356
Diluted earnings per share	$	0.82		$	0.29	$	1.11
Weighted average common shares outstanding — diluted	320.0			320.0		320.0

34

Free Cash Flow

We use free cash flow, defined as cash flow provided by operations minus capital expenditures, as a non-GAAP measure of our core operating performance. This supplemental information related to free cash flow represents a measure not in accordance with U.S. GAAP and should be viewed in addition to, not instead of, our Condensed Consolidated Financial Statements and Notes thereto. The use of this non-GAAP measure does not imply or represent the residual cash flow for discretionary expenditures.

A reconciliation of this non-GAAP measure to Cash flow provided by operations is as follows (in millions):

	Three months ended March 31,
	2014			2013
Cash flow provided by operations - U.S. GAAP	$	(11	)	$	54
Less: Capital expenditures	(55		)	(60		)
Free cash flow	$	(66	)	$	(6	)

Impact of Foreign Exchange Rate Fluctuations

Because we conduct business in more than 120 countries, foreign exchange rate fluctuations have a significant impact on our business.  In comparison to the U.S. dollar, foreign exchange rate movements may be significant and may distort true period-to-period comparisons of changes in revenue or pretax income.  Therefore, to give financial statement users meaningful information about our operations, we have provided an illustration of the impact of foreign currency exchange rates on our financial results.  The methodology used to calculate this impact isolates the impact of the change in currencies between periods by translating last year’s revenue, expenses and net income, using current year's foreign exchange rates.  Using this illustrative methodology, currency fluctuations had no impact and a favorable impact of $0.02 during the three months endedMarch 31, 2014 and 2013, respectively, on adjusted net income per diluted share, when we translate prior year quarter results at current quarter foreign exchange rates. These translations are performed for comparative and illustrative purposes only and do not impact the accounting policy or practices for amounts included in the Condensed Consolidated Financial Statements.

Summary of Results

Our consolidated results of operations follow (in millions):

	Three months ended March 31,
	2014			2013
Revenue:
Commissions, fees and other	$	2,941		$	2,908
Fiduciary investment income	6			7
Total revenue	2,947			2,915
Expenses:
Compensation and benefits	1,751			1,725
Other general expenses	727			780
Total operating expenses	2,478			2,505
Operating income	469			410
Interest income	2			1
Interest expense	(58		)	(52		)
Other income	1			9
Income before income taxes	414			368
Income taxes	78			96
Net income	336			272
Less: Net income attributable to noncontrolling interests	11			11
Net income attributable to Aon shareholders	$	325		$	261

35

Revenue

Revenue increased by $32 million, or 1%, in the first quarter 2014 compared to the first quarter 2013.  The first quarter increase consists of a $23 million, or 1%, increase in the Risk Solutions segment and an $11 million, or 1%, increase in the HR Solutions segment. The results of the Risk Solutions segment reflect 3% organic revenue growth, partially offset by a decrease in Fiduciary investment income. The increase in Risk Solutions revenue compared to the prior year quarter was primarily driven by solid growth in Retail brokerage across both the Americas and International businesses, as well as solid growth in our reinsurance business. Organic revenue growth in the HR Solutions segment for the quarter was 1%, primarily driven by growth in investment and compensation consulting and modest growth in benefits administration and human resources business process outsourcing, partially offset by the unfavorable impact from the timing of revenue in the quarter.

Compensation and Benefits

Compensation and benefits increased$26 million, or 2%, from first quarter 2013. For the quarter ended March 31, 2014, the increase in Compensation and benefits was primarily driven by an increase in expense to support future growth in our health care exchange business and an increase in expense associated with 2% organic revenue growth, partially offset by restructuring savings, a $24 million decrease in formal restructuring costs, a $13 million favorable impact from foreign currency exchange rates, and a $12 million decrease in expenses related to acquisitions, net of divestitures.

Other General Expenses

Other general expenses decreased$53 million, or 7%, in the first quarter 2014 compared to the prior year quarter. The decrease was due to expense discipline, intangible amortization expense decrease of $13 million, a $5 million favorable impact from foreign currency exchange rates, and restructuring savings.

Interest Income

Interest income represents income earned on operating cash balances and other income-producing investments.  It does not include interest earned on funds held on behalf of clients.  During the first quarter 2014, Interest income increased$1 million compared to the first quarter 2013 to $2 million in the first quarter 2014 .

Interest Expense

Interest expense, for the first quarter of 2014, which represents the cost of our worldwide debt obligations, increased$6 million from the first quarter of 2013. The increase in interest expense reflects an increase in the total debt outstanding and an increase in costs related to certain derivative programs.

Other Income

Other income was $1 million for the first quarter of 2014, compared to $9 million for the first quarter of 2013.  The first quarter 2014 includes a $19 million gain on foreign currency remeasurement and equity earnings of $5 million, partially offset by $23 million loss from derivatives. The first quarter 2013 includes a $24 million gain on foreign currency remeasurement and additional income from equity method investments of $2 million, partially offset by an $18 million loss from derivatives.

Income before Income Taxes

Income before income taxes for the first quarter was $414 million, a 13%increase from $368 million in 2013.  The increase in income was driven by the 2% increase in organic growth, expense discipline, and increased benefits from restructuring initiatives.

Income Taxes

The effective tax rate on net income was 18.9% and 26.1% for the quarters ended March 31, 2014 and 2013, respectively. The effective tax rate in the first quarter of 2014 was favorably impacted by changes in the geographic distribution of income. Potential unfavorable discrete tax adjustments in future quarters of 2014 could cause the effective tax rate for the full year 2014 to be higher than the effective tax rate reported in the first quarter of 2014.

36

Net Income Attributable to Aon Shareholders

Net income attributable to Aon shareholders for the first quarter increased to $325 million, or $1.06 diluted net income per share, from $261 million, or $0.82 diluted net income per share, in 2013.

LIQUIDITY AND FINANCIAL CONDITION

Liquidity

Executive Summary

We believe that our balance sheet and strong cash flow provide us with financial flexibility to create long-term value for our shareholders.  Our primary sources of liquidity are cash flow from operations, available cash reserves and debt capacity available under various credit facilities.  Our primary uses of liquidity are operating expenses, capital expenditures, acquisitions, share repurchases, restructuring initiatives, funding pension obligations and shareholder dividends.

Cash on our balance sheet includes funds available for general corporate purposes, as well as amounts restricted as to their use.  Funds held on behalf of clients in a fiduciary capacity are segregated and shown together with uncollected insurance premiums in Fiduciary assets in the Condensed Consolidated Statement of Financial Position, with a corresponding amount in Fiduciary liabilities. Fiduciary funds cannot be used for general corporate purposes, and are not a source of liquidity for us.

Operating Activities

Net cash used for operating activities during the three months ended March 31, 2014 was $11 million compared to net cash provided by operating activities during the three months ended March 31, 2013 of $54 million, a decrease of $65 million. The decrease from the prior year period was primarily driven by a smaller decrease in accounts receivable of $161 million due to revenue growth and strong working capital management during 2013, a larger decrease in accounts payable and accrued liabilities of $51 million due primarily to the timing of certain incentive payments, and a $24 million increase in payments for restructuring reserves, partially offset by higher net income, adjusted for non-cash items, of $77 million and a reduction in pension contributions of $68 million from the prior year period.

The primary uses of cash from operating activities during the three months ended March 31, 2014 were a decrease in accounts payable and accrued liabilities of $468 million, pension contributions of $128 million and a decrease in restructuring reserves of $40 million, partially offset by net income, adjusted for non-cash items, of $589 million and a decrease in accounts receivable of $13 million. Pension contributions were $128 million and $196 million for the three months ended March 31, 2014 and 2013, respectively. For the remainder of 2014, we expect to contribute approximately $257 million to our pension plans, with the majority attributable to non-U.S. pension plans, which are subject to changes in foreign exchange rates.

We expect cash generated by operations for 2014 to be sufficient to service our debt and contractual obligations, fund the cash requirements of our restructuring programs, finance capital expenditures, continue purchases of shares under our share repurchase program, and continue to pay dividends to our shareholders.  Although cash from operations is expected to be sufficient to service these activities, we have the ability to borrow under our credit facilities to accommodate any timing differences in cash flows.  We have committed credit facilities of approximately $1.3 billion, of which all was available at March 31, 2014.  We can access these facilities on a same day or next day basis.  Additionally, under current market conditions, we believe that we could access capital markets to obtain debt financing for longer-term funding, if needed.

Investing Activities

Cash flow provided by investing activities was $156 million during the three months ended March 31, 2014. The primary drivers of the cash flow provided by investing activities were net sales of short-term investments of $183 million and $32 million for net sales of long term investments, partially offset by $55 million for capital expenditures. The cash flows provided by the net sales of long term investments represent the cash proceeds generated from net sales of long term investments where the corresponding gains and losses are recognized in Other income in the Condensed Consolidated Statements of Income.

Cash flow used for investing activities was $62 million during the three months ended March 31, 2013. The primary drivers of the cash flow used for investing activities were $60 million for capital expenditures, $16 million for net purchases of short-term investments, and $3 million for purchases of long-term investments, partially offset by $18 million for sales of long-term investments.

37

Financing Activities

Cash flow used for financing activities during the three months ended March 31, 2014 was $260 million. The primary drivers of the cash flow used for financing activities were share repurchases of $600 million and dividends paid to shareholders of $53 million, partially offset by issuances of debt, net of repayments, of $366 million and proceeds from the exercise of share options and issuance of shares purchased through the employee stock purchase plan of $26 million.

Cash flow provided by financing activities during the three months ended March 31, 2013 was $120 million. The primary drivers of cash flow provided by financing activities were issuances of debt, net of repayments, of $435 million and proceeds from the exercise of share options and issuance of shares purchased through the employee stock purchase plan of $36 million, partially offset by share repurchases of $300 million and dividends paid to shareholders of $50 million.

As a U.K. incorporated company, we must have “distributable reserves” to make share repurchases or pay dividends to shareholders. Distributable reserves may be created through the earnings of the U.K. parent company and, amongst other methods, through a reduction in share capital approved by the English Companies Court. Distributable reserves are not linked to a U.S. GAAP reported amount (e.g., retained earnings). As of March 31, 2014 and 2013, we had distributable reserves in excess of $5.1 billion and $6.6 billion, respectively. We believe that we will have sufficient distributable reserves to fund shareholder dividends for the foreseeable future.

Cash and Investments

At March 31, 2014, our cash and cash equivalents and short-term investments were $678 million, a decrease of $322 million from December 31, 2013, primarily related to share repurchases of $600 million and dividends of $53 million, partially offset by the net issuance of commercial paper of $374 million  Of the total balance as of March 31, 2014, $253 million was restricted as to its use, which was comprised of $128 million of operating funds in the U.K. as required by the Financial Conduct Authority and $125 million held as collateral for various business purposes.  At March 31, 2014, $969 million of cash and cash equivalents and short-term investments were held in the U.S. and overdrawn cash and cash equivalents and short-term investments of $291 million were held in other countries. We maintain a multicurrency cash pool with a third party bank in which various Aon entities participate. Individual Aon entities are permitted to overdraw on their individual accounts provided the overall balance does not fall below zero. At March 31, 2014, non-U.S. cash balances of one or more entities were negative; however, the overall balance was positive.

Of the total balance as of December 31, 2013, $214 million was restricted as to its use, which was comprised of $126 million of operating funds in the U.K. as required by the Financial Conduct Authority and $88 million held as collateral for various business purposes. At December 31, 2013, $516 million of cash and cash equivalents and short-term investments were held in the U.S. and $484 million was held in other countries.

In our capacity as an insurance broker or agent, we collect premiums from insureds and, after deducting our commission, remit the premiums to the respective insurance underwriter.  We also collect claims or refunds from underwriters on behalf of insureds, which are then returned to the insureds.  Unremitted insurance premiums and claims are held by us in a fiduciary capacity.  In addition, some of our outsourcing agreements require us to hold funds on behalf of clients to pay obligations on their behalf.  The levels of fiduciary assets and liabilities can fluctuate significantly, depending on when we collect the premiums, claims and refunds, make payments to underwriters and insureds, collect funds from clients and make payments on their behalf, and foreign currency movements.  Fiduciary assets, because of their nature, are required to be invested in very liquid securities with highly-rated, credit-worthy financial institutions.  In our Condensed Consolidated Statements of Financial Position, the amount we report for Fiduciary assets and Fiduciary liabilities are equal.  Our Fiduciary assets included cash and investments of $4.1 billion and $3.8 billion and fiduciary receivables of $8.0 billion and $8.1 billion at March 31, 2014 and December 31, 2013, respectively.  While we earn investment income on the fiduciary assets held in cash and investments, the cash and investments are not owned by us, and cannot be used for general corporate purposes.

As disclosed in Note 15 “Fair Value Measurements and Financial Instruments” of the Notes to the Condensed Consolidated Financial Statements, the majority of our investments carried at fair value are money market funds.  Money market funds are carried at cost as an approximation of fair value.  Consistent with market convention, we consider cost a practical and expedient measure of fair value.  These money market funds are held throughout the world with various financial institutions.  We do not believe that there are any market liquidity issues that would materially impact the fair value of these investments.

As of March 31, 2014, our investments in money market funds and highly liquid debt instruments had a fair value of $2.1 billion and are reported as Short-term investments or Fiduciary assets in the Condensed Consolidated Statements of Financial Position depending on their nature and initial maturity.

38

The following table summarizes our Fiduciary assets and non-fiduciary Cash and cash equivalents, and Short-term investments as of March 31, 2014 (in millions):

	Statement of Financial Position Classification
Asset Type	Cash and Cash Equivalents		Short-term Investments		Fiduciary Assets		Total
Certificates of deposit, bank deposits or time deposits	$	338	$	—	$	2,342	$	2,680
Money market funds	—		340		1,721		2,061
Highly liquid debt instruments	—		—		25		25
Other investments due within one year	—		—		—		—
Cash and investments	338		340		4,088		4,766
Fiduciary receivables	—		—		7,950		7,950
Total	$	338	$	340	$	12,038	$	12,716

Share Repurchase Program

In April 2012, our Board of Directors authorized a share repurchase program under which up to $5 billion of Class A Ordinary Shares may be repurchased ("2012 Share Repurchase Program"). Under this program, shares may be repurchased through the open market or in privately negotiated transactions, from time to time, based on prevailing market conditions, and will be funded from available capital.

In the first quarter of 2014, the Company repurchased 7.2 million shares at an average price per share of $83.45 for a total cost of $600 million under the 2012 Share Repurchase Program. In the first quarter of 2013, the Company repurchased 5.0 million shares at an average price per share of $59.82 for a total cost of $300 million under the 2012 Share Repurchase Program. Since the inception of the 2012 Share Repurchase Program, we repurchased a total of 43.5 million shares for an aggregate cost of $2.7 billion. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is approximately $2.3 billion.

For information regarding share repurchases made during the first quarter of 2014, see Part II, Item 2 — “Unregistered Sales of Equity Securities and Use of Proceeds” below.

Borrowings

Total debt at March 31, 2014 was $4.7 billion, which represents an increase of $357 million compared to December 31, 2013.This increase is primarily due to an increase in commercial paper outstanding of $374 million compared to December 31, 2013.Commercial paper activity during the three months ended March 31, 2014 included total issuances of $1.2 billion, compared to $883 million for the three months ended March 31, 2013. The proceeds of the commercial paper issuances were used primarily for short-term working capital needs.

Our total debt as a percentage of total capital attributable to Aon shareholders was 37.4% and 35.0% at March 31, 2014 and December 31, 2013, respectively.

Credit Facilities

At March 31, 2014, we have a five-year $400 million unsecured revolving credit facility in the U.S. (“U.S. Facility”) that expires in 2017. The U.S. facility is for general corporate purposes, including commercial paper support.  Additionally, we have a five-year €650 million ($896 million at March 31, 2014 exchange rate) credit facility ("Euro Facility") available, which expires in October 2015.  At March 31, 2014, we had no borrowings under either of these credit facilities.

For both our U.S. Facility and Euro Facility, the two most significant covenants require us to maintain a certain ratio of consolidated EBITDA (earnings before interest, taxes, depreciation and amortization), adjusted for Hewitt related transaction costs and up to $50 million in non-recurring cash charges (“Adjusted EBITDA”), to consolidated interest expense and a ratio of consolidated debt to Adjusted EBITDA. For both facilities, the ratio of Adjusted EBITDA to consolidated interest expense must be at least 4 to 1.  For the Euro Facility, the ratio of consolidated debt to Adjusted EBITDA must not exceed 3 to 1.  For the U.S. Facility, the ratio of consolidated debt to Adjusted EBITDA must not exceed the lower of (a) 3.25 to 1.00 or (b) the greater of (i) 3.00 to 1.00 or (ii) the lowest ratio of consolidated debt to Adjusted EBITDA then set forth in the Euro Facility or Aon’s

39

$450 million Term Loan Facility. We were in compliance with these and all other covenants during the three months ended March 31, 2014. 

Shelf Registration Statement

On August 31, 2012, we filed a shelf registration statement with the SEC, registering the offer and sale from time to time of an indeterminate amount of, among other securities, debt, securities, preference shares, Class A Ordinary Shares and convertible securities. The availability of any potential liquidity for these types of securities is dependent on investor demand, market conditions and other factors.

Rating Agency Ratings

The major rating agencies’ ratings of our debt at April 25, 2014 appear in the table below. 

	Ratings
	Senior Long-term Debt	Commercial Paper	Outlook
Standard & Poor’s	A-	A-2	Stable
Moody’s Investor Services	Baa2	P-2	Stable
Fitch, Inc.	BBB+	F-2	Stable

In April 2014, Moody's Investor Services changed their outlook from positive to stable.

A downgrade in the credit ratings of our senior debt and commercial paper would increase our borrowing costs, reduce or eliminate our access to capital, reduce our financial flexibility, increase our commercial paper interest rates or possibly restrict our access to the commercial paper market altogether, or may impact future pension contribution requirements.

Letters of Credit and Other Guarantees

We had total letters of credit ("LOCs") outstanding for approximately $66 million at March 31, 2014, compared to $71 million at December 31, 2013. These letters of credit cover the beneficiaries related to certain of our U.S. and Canadian non-qualified pension plan schemes and secure deductible retentions for our own workers compensation program. We also have issued LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at our international subsidiaries.

We have certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies.  Costs associated with these guarantees, to the extent estimable and probable, are provided in our allowance for doubtful accounts.  The maximum exposure with respect to such contractual contingent guarantees was approximately $64 million at March 31, 2014 compared to $98 million at December 31, 2013.

We have provided commitments to fund certain limited partnerships in which we have an interest in the event that the general partners request funding.  Some of these commitments have specific expiration dates and the maximum potential funding under these commitments was $24 million and $34 million at March 31, 2014 and December 31, 2013, respectively.  During the three months endedMarch 31, 2014, we funded $10 million of these commitments.

Adequacy of Liquidity Sources

We believe that cash flows from operations and available credit facilities will be sufficient to meet our liquidity needs, including principal and interest payments on debt obligations, capital expenditures, pension contributions, cash restructuring costs, and anticipated working capital requirements, for the foreseeable future. We do not have exposure related to off balance sheet arrangements. Our cash flows from operations, borrowing availability and overall liquidity are subject to risks and uncertainties. See “Information Concerning Forward-Looking Statements” below.

40

Financial Condition

At March 31, 2014, our net assets of $8.0 billion, representing total assets minus total liabilities, decreased from $8.2 billion at December 31, 2013. The decrease was due primarily to share repurchases of $600 million, dividends of $53 million, and a decrease in Accumulated other comprehensive loss of $54 million related primarily to foreign currency translation adjustment and post-retirement benefit obligation, partially offset by Net income of $336 million for the three months ended March 31, 2014.  Working capital decreased by $327 million to $592 million from December 31, 2013.

Equity

Equity at March 31, 2014 was $8.0 billion, a decrease of $189 million from December 31, 2013.  The decrease resulted primarily from share repurchases of $600 million, $53 million of dividends to shareholders, and a decrease in Accumulated other comprehensive loss of $54 million, partially offset by Net income of $336 million.

The $54 milliondecrease in Accumulated other comprehensive loss from December 31, 2013 primarily reflects the following:

• positive net foreign currency translation adjustments of $18 million, which are attributable to the weakening of the U.S. dollar against certain foreign currencies,

• a decrease of $26 million in net post-retirement benefit obligations,

• net derivative gains of $9 million, and

• net investment gains of $1 million.

REVIEW BY SEGMENT

General

We serve clients through the following segments:

• Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through our global distribution network.

• HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies.

Risk Solutions

	Three months ended March 31,
(millions, except percentage data)	2014			2013
Revenue	$	1,994		$	1,971
Operating income	445			403
Operating margin	22.3		%	20.4		%

The demand for property and casualty insurance generally rises as the overall level of economic activity increases and generally falls as such activity decreases, affecting both the commissions and fees generated by our brokerage business. The economic activity that impacts property and casualty insurance is described as exposure units, and is most closely correlated with employment levels, corporate revenue and asset values.  During the first three months of 2014, pricing was flat on average globally, and we would still consider this to be a “soft market.”  In a soft market, premium rates flatten or decrease, along with commission revenues, due to increased competition for market share among insurance carriers or increased underwriting capacity.  Changes in premiums have a direct and potentially material impact on the insurance brokerage industry, as commission revenues are generally based on a percentage of the premiums paid by insureds.

Additionally, continuing into the first quarter of 2014, we faced difficult conditions as a result of unprecedented disruptions in the global economy, the repricing of credit risk and the deterioration of the financial markets.  Weak economic conditions in many markets around the globe have reduced our customers’ demand for our retail brokerage and reinsurance brokerage products, which have had a negative impact on our operational results.

41

Risk Solutions generated approximately 67% of our consolidated total revenues in the first quarter of 2014.  Revenues are generated primarily through fees paid by clients, commissions and fees paid by insurance and reinsurance companies, and investment income on funds held on behalf of clients.  Our revenues vary from quarter to quarter throughout the year as a result of the timing of our clients’ policy renewals, the net effect of new and lost business, the timing of services provided to our clients, and the income we earn on investments, which is heavily influenced by short-term interest rates.

We operate in a highly competitive industry and compete with many retail insurance brokerage and agency firms, as well as with individual brokers, agents, and direct writers of insurance coverage.  Specifically, we address the highly specialized product development and risk management needs of commercial enterprises, professional groups, insurance companies, governments, health care providers, and non-profit groups, among others; provide affinity products for professional liability, life, disability income, and personal lines for individuals, associations, and businesses; provide products and services via GRIP Solutions; provide reinsurance services to insurance and reinsurance companies and other risk assumption entities by acting as brokers or intermediaries on all classes of reinsurance; provide capital management transaction and advisory products and services, including mergers and acquisitions and other financial advisory services, capital raising, contingent capital financing, insurance-linked securitizations and derivative applications; provide managing underwriting to independent agents and brokers as well as corporate clients; provide risk consulting, actuarial, loss prevention, and administrative services to businesses and consumers; and manage captive insurance companies.

Revenue

Commissions, fees and other revenue for Risk Solutions were as follows (in millions):

	Three months ended March 31,
	2014		2013
Retail brokerage:
Americas	$	698	$	686
International (1)	881		876
Total retail brokerage	1,579		1,562
Reinsurance brokerage	409		402
Total	$	1,988	$	1,964

  ______________________________________________

(1) Includes the U.K., Europe, Middle East, Africa and Asia Pacific.

During the first quarter 2014, commissions, fees and other revenue increased$24 million, or 1%, compared to the first quarter 2013, due to 3% organic revenue growth, partially offset by 1% unfavorable impact from foreign exchange rates, 1% decrease related to acquisitions, net of dispositions, and a decline in investment income.

Reconciliation of organic revenue growth to reported commissions, fees and other revenue growth for 2014 versus 2013 is as follows:

Three months ended March 31, 2014	Percent Change		Less: Currency Impact		Less: Acquisitions, Divestitures & Other		Organic Revenue
Retail brokerage:
Americas	2	%	(3	)%	1	%	4	%
International (1)	1		—		(2	)	3
Total retail brokerage	1		(1	)	(1	)	3
Reinsurance brokerage	2		(1	)	—		3
Total	1	%	(1	)%	(1	)%	3	%

  ______________________________________________

(1) Includes the U.K., Europe, Middle East, Africa and Asia Pacific.

Retail brokerage Commissions, fees and other revenue increased 1% in the first quarter driven by 4% and 3% organic revenue growth in the Americas and International operations, respectively, partially offset by a decline in investment income, a 1% decrease related to acquisitions, net of dispositions, and a 1% unfavorable impact from foreign exchange rates.

42

Americas Commissions, fees and other revenue increased 2% in the first quarter reflecting 4% growth in organic revenue due to new business generation in U.S. Retail and strong management of the renewal book portfolio across Latin America and Canada, and a 1% increase related to acquisitions, net of dispositions, partially offset by a 3% unfavorable impact from foreign exchange rates.

International Commissions, fees and other revenue increased 1% in the first quarter driven by a 3% increase in organic revenue growth, partially offset by a 2% unfavorable impact from acquisitions, net of divestitures. Organic growth of 3% was driven by strong growth across emerging markets and Asia and solid management of the renewal book portfolio across continental Europe.

Reinsurance brokerage Commissions, fees and other revenue increased 2% in the first quarter driven by a 3% increase in organic revenue growth, partially offset by a 1% unfavorable impact from foreign exchange rates. The increase in organic revenue growth is due primarily to growth in facultative placements and capital markets transactions and advisory business, as well as net new business growth in treaty placements, offset by an unfavorable market impact in the quarter.

Operating Income

Operating income for the first quarter 2014increased$42 million, or 10%, from 2013 to $445 million in 2014, and operating income margins increased to 22.3% from 20.4% in 2013.  Operating margin improvement was driven by organic revenue growth, expense discipline, and savings related to restructuring programs.

HR Solutions

	Three months ended March 31,
(millions, except percentage data)	2014			2013
Revenue	$	965		$	954
Operating income	67			51
Operating margin	6.9		%	5.3		%

Our HR Solutions segment generated approximately 33% of our consolidated total revenues the first quarter of 2014 and provides a broad range of human capital services, as follows:

· Retirement specializes in global actuarial services, defined contribution consulting, tax and ERISA consulting, and pension administration.

· Compensation focuses on compensatory advisory/counsel including: compensation planning design, executive reward strategies, salary survey and benchmarking, market share studies and sales force effectiveness, with special expertise in the financial services and technology industries.

· Strategic Human Capital delivers advice to complex global organizations on talent, change and organizational effectiveness issues, including talent strategy and acquisition, executive on-boarding, performance management, leadership assessment and development, communication strategy, workforce training and change management.

· Investment consulting advises public and private companies, other institutions and trustees on developing and maintaining investment programs across a broad range of plan types, including defined benefit plans, defined contribution plans, endowments and foundations.

· Benefits Administration applies our HR expertise primarily through defined benefit (pension), defined contribution (401(k)), and health and welfare administrative services. Our model replaces the resource-intensive processes once required to administer benefit plans with more efficient, effective, and less costly solutions.

· Exchanges is building and operating healthcare exchanges that provide employers with a cost effective alternative to traditional employee and retiree healthcare, while helping individuals select the insurance that best meets their needs.

· Human Resource Business Processing Outsourcing (“HR BPO”) provides market-leading solutions to manage employee data; administer benefits, payroll and other human resources processes; and record and manage talent, workforce and other core HR process transactions as well as other complementary services such as flexible spending, dependent audit and participant advocacy.

Disruption in the global credit markets and the deterioration of the financial markets created significant uncertainty in the marketplace.  Weak economic conditions in many markets around the globe continued into the first quarter of 2014 and have adversely impacted our clients’ financial condition and therefore the levels of business activities in the industries and geographies where we operate.  While we believe that the majority of our practices are well positioned to manage through this

43

time, these challenges are reducing demand for some of our services and putting continued pressure on the pricing of those services, which is having an adverse effect on our new business and results of operations.

Revenue

Commissions, fees and other revenue for HR Solutions increased$11 million, or 1%, in the first quarter 2014 compared to the first quarter 2013. The increase in revenue was driven by 1% organic growth in commissions and fees.

Commissions, fees and other revenue were as follows (in millions):

	Three months ended March 31,
	2014			2013
Consulting services	$	384		$	382
Outsourcing	589			581
Intersegment	(8		)	(9		)
Total	$	965		$	954

Reconciliation of organic revenue growth to reported commissions, fees and other revenue growth for 2014 versus 2013 is as follows:

Three months ended March 31, 2014	Percent Change		Less: Currency Impact		Less: Acquisitions, Divestitures & Other		Organic Revenue
Consulting services	1	%	1	%	(1	)%	1	%
Outsourcing	1		—		—		1
Intersegment	N/A		N/A		N/A		N/A
Total	1	%	—	%	—	%	1	%

Consulting services revenue increased$2 million, or 1%, for the first quarter due primarily to 1% organic revenue growth driven by growth in investment and compensation consulting, partially offset by an unfavorable impact from timing of certain revenues in the quarter.

Outsourcing revenue increased$8 million, or 1%, for the first quarter due primarily to 1% organic revenue growth driven by modest growth in benefits administration and human resources business process outsourcing.

Operating Income

Operating income was $67 million, an increase of $16 million, or 31%, from the first quarter of 2013. The increase was primarily due to modest organic revenue growth and savings related to the Aon Hewitt restructuring program, partially offset by an increase in expense to support future growth in our health care exchange business and an unfavorable impact from timing of certain consulting revenue. Operating margin for this segment was 6.9% in the first quarter, which is an increase from 5.3% in 2013.

44

Unallocated Income and Expense

A reconciliation of our operating income to income before income taxes is as follows (in millions):

	Three months ended March 31,
	2014			2013
Operating income (loss):
Risk Solutions	$	445		$	403
HR Solutions	67			51
Unallocated	(43		)	(44		)
Operating income	469			410
Interest income	2			1
Interest expense	(58		)	(52		)
Other income	1			9
Income before income taxes	$	414		$	368

Unallocated operating expense

Unallocated operating expense includes corporate governance costs not allocated to the operating segments.  Net unallocated expenses decreased$1 million to $43 million in the first quarter 2014. The decrease in unallocated expenses during the three months ended March 31, 2014 is due primarily to decrease in expenses related to the Company's redomicile to the U.K. compared to such expenses in 2013.

Interest income

Interest income represents income earned on operating cash balances and other income-producing investments.  It does not include interest earned on funds held on behalf of clients.  During the first quarter 2014, Interest income increased$1 million to $2 million in the first quarter 2014 compared to the first quarter 2013.

Interest expense

Interest expense, which represents the cost of our worldwide debt obligations, increased$6 million compared to the first quarter of 2013. The increase in interest expense reflects an increase in the total debt outstanding and an increase in costs related to certain derivative programs.

Other income

Other income was $1 million for the first quarter of 2014, compared to $9 million for the first quarter of 2013.  The first quarter 2014 includes a $19 million gain on foreign currency remeasurement and equity earnings of $5 million, partially offset by $23 million loss from derivatives. The first quarter 2013 includes a $24 million gain on foreign currency remeasurement and additional income from equity method investments of $2 million, partially offset by an $18 million loss from derivatives.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

There have been no changes in our critical accounting policies, which include revenue recognition, restructuring, pensions, goodwill and other intangible assets, contingencies, share-based payments, and income taxes, as discussed in our 2013 Annual Report on Form 10-K.

NEW ACCOUNTING PRONOUNCEMENTS

Note 2 “Accounting Principles and Practices” of the Notes to the Condensed Consolidated Financial Statements contains a discussion of recently issued accounting pronouncements and their impact or future potential impact on our financial results, if determinable.

45

INFORMATION CONCERNING FORWARD-LOOKING STATEMENTS

This report contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995.  Forward-looking statements relate to expectations or forecasts of future events.  They use words such as “anticipate,” “believe,” “estimate,” “expect,” “forecast,” “project,” “intend,” “plan,” “potential,” and other similar terms, and future or conditional tense verbs like “could,” “may,” “might,” “should,” “will” and “would.”  You can also identify forward-looking statements by the fact that they do not relate strictly to historical or current facts.  For example, we may use forward-looking statements when addressing topics such as:  market and industry conditions, including competitive and pricing trends; changes in our business strategies and methods of generating revenue; the development and performance of our services and products; changes in the composition or level of our revenues; our cost structure and the outcome of cost-saving or restructuring initiatives; the outcome of contingencies; dividend policy; the expected impact of acquisitions and dispositions; pension obligations; cash flow and liquidity; expected effective tax rate; future actions by regulators; and the impact of changes in accounting rules.  These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. Potential factors that could impact results include:

· general economic conditions in different countries in which Aon does business around the world, including conditions in emerging markets and in the European Union relating to sovereign debt and the continued viability of the Euro;

· changes in the competitive environment;

· changes in global equity and fixed income markets that could influence the return on invested assets;

· changes in the funding status of our various defined benefit pension plans and the impact of any increased pension funding resulting from those changes;

· rating agency actions that could affect our ability to borrow funds;

· fluctuations in exchange and interest rates that could impact revenue and expense;

· the impact of class actions, individual lawsuits, and other contingent liabilities and loss contingencies arising from errors and omissions and other claims against us including client class actions, securities class actions, derivative actions and ERISA class actions;

· the impact of any investigations brought by regulatory authorities in the U.S., U.K. and other countries;

· failure to retain and attract qualified personnel;

· the impact of, and potential challenges in complying with, legislation and regulation in the jurisdictions in which we operate, particularly given the global scope of our business and the possibility of conflicting regulatory requirements across jurisdictions in which we do business;

· the effect of the Redomestication on our operations and financial results, including the reaction of our clients, employees and other constituents, the effect of compliance with applicable U.K. regulatory regimes or the failure to realize some or all of the anticipated benefits;

· the extent to which we retain existing clients and attract new businesses and our ability to incentivize and retain key employees;

· the extent to which we manage certain risks created in connection with the various services, including fiduciary and advisory services, among others, that we currently provide, or will provide in the future, to clients;

· our ability to implement restructuring initiatives and other initiatives intended to yield cost savings, and the ability to achieve those cost savings;

· the potential of a system or network breach or disruption resulting in operational interruption or improper disclosure of client information or personal data;

· changes in commercial property and casualty markets and commercial premium rates that could impact revenues;

· any inquiries relating to compliance with the U.S. Foreign Corrupt Practices Act and non-U.S. anti-corruption laws and with U.S. and non-U.S. trade sanctions regimes;

· failure to protect intellectual property rights or allegations that we infringe on the intellectual property rights of others;

· the damage to our reputation among clients, markets or other third parties;

· the actions taken by third parties that perform aspects of our business operations and client services;

· changes in costs or assumptions associated with our HR Solutions segment's outsourcing and consulting arrangements that affect the profitability of these arrangements; and

· our ability to grow and develop companies that we acquire or new lines of business.

Any or all of our forward-looking statements may turn out to be inaccurate, and there are no guarantees about our performance.  The factors identified above are not exhaustive.  Aon and its subsidiaries operate in a dynamic business environment in which new risks may emerge frequently.  Accordingly, readers should not place undue reliance on forward-looking statements, which

46

speak only as of the dates on which they are made.  We are under no obligation (and expressly disclaim any obligation) to update or alter any forward-looking statement that we may make from time to time, whether as a result of new information, future events or otherwise.  Further information about factors that could materially affect Aon, including our results of operations and financial condition, is contained in the “Risk Factors” sections in each of Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2013 and Part II, Item 1A of this report below.

ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to potential fluctuations in earnings, cash flows and the fair value of certain of our assets and liabilities due to changes in interest rates and foreign exchange rates.  To manage the risk from these exposures, we enter into a variety of derivative instruments.  We do not enter into derivatives or financial instruments for trading or speculative purposes.

The following discussion describes our specific exposures and the strategies we use to manage these risks. There have been no changes in our critical accounting policies for financial instruments and derivatives as discussed in our 2013 Annual Report on Form 10-K.

Foreign Exchange Risk

We are subject to foreign exchange rate risk. Our primary exposures include exchange rates between the U.S. dollar and the Euro, British Pound, the Canadian Dollar, the Australian Dollar, and the Indian Rupee.  We use over-the-counter options and forward contracts to reduce the impact of foreign currency risk to our financial statements.

Additionally, some of our non-U.S. brokerage subsidiaries receive revenues in currencies that differ from their functional currencies.  Our U.K. subsidiary earns a portion of its revenue in U.S. dollars and Euros, but most of its expenses are incurred in Pounds Sterling.  At March 31, 2014, we have hedged approximately 45% and 81% of our U.K. subsidiaries’ expected U.S. Dollar transaction exposure for the years ending December 31, 2014 and 2015, respectively. In addition, we have hedged 81% of our U.K. subsidiaries' expected Euro transaction exposures for the same time periods. We generally do not hedge exposures beyond three years.

We also use forward contracts to economically hedge foreign exchange risk associated with monetary balance sheet exposures, such as inter-company notes and short-term assets and liabilities that are denominated in a non-functional currency and are subject to remeasurement.

The translated value of revenue and expense from our international brokerage operations are subject to fluctuations in foreign exchange rates. If the Company were to translate prior year results at current quarter exchange rates, diluted earnings per share would not be impacted during the three months endedMarch 31, 2014.  Further, adjusted diluted earnings per share, a non-GAAP measure as defined and reconciled under the caption “Review of Consolidated Results Adjusted Diluted Earnings Per Share" would not be impacted during the three months endedMarch 31, 2014, if the Company were to translate prior year results at current quarter exchange rates.

Interest Rate Risk

Our fiduciary investment income is affected by changes in international and domestic short-term interest rates.  We monitor our net exposure to short-term interest rates and, as appropriate, hedge our exposure with various derivative financial instruments.  This activity primarily relates to brokerage funds held on behalf of clients in the U.S. and on the continent of Europe. A decrease in global short-term interest rates adversely affects our fiduciary investment income.

ITEM 4.   CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures.  We have conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) as of the end of the period covered by this quarterly report of March 31, 2014.  Based on this evaluation, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective such that the information relating to Aon, including our consolidated subsidiaries, required to be disclosed in our Securities and Exchange Commission (“SEC”) reports is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms, and is accumulated and communicated to Aon’s management, including our chief executive officer and chief financial officer, as appropriate to allow timely decisions regarding required disclosure.

47

Changes in internal control over financial reporting.  No changes in Aon's internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) occurred during the quarter ended March 31, 2014 that have materially affected, or that are reasonably likely to materially affect, Aon's internal control over financial reporting.

48

PART II

OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

See Note 16 "Commitments and Contingencies" to the Condensed Consolidated Financial Statements contained in Part I, Item 1, which is incorporated by reference herein.

ITEM 1A.RISK FACTORS.

The risk factors set forth in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2013 reflect certain risks associated with existing and potential lines of business and contain “forward-looking statements” as discussed in Part I, Item 2 of this report.  Readers should consider them in addition to the other information contained in this report as our business, financial condition or results of operations could be adversely affected if any of these risks actually occur.

ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a)  None.

(b)  None.

(c)  Issuer Purchases of Equity Securities.

The following information relates to the purchase of equity securities by Aon or any affiliated purchaser during each month within the first quarter of 2014:

Period	Total Number of Shares Purchased	Average Price Paid per Share (1)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Maximum Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (1)  (2)
1/1/14 — 1/31/14	—	$	—	—	$	2,873,588,140
2/1/14 — 2/28/14	6,375,310	83.12		6,375,310	2,343,661,176
3/1/14 — 3/31/14	813,378	86.04		813,378	2,273,679,205
Total	7,188,688	$	83.45	7,188,688	$	2,273,679,205

  ______________________________________________

(1) Does not include commissions paid to repurchase shares.

(2)   In April 2012, our Board of Directors authorized a share repurchase program under which up to $5 billion of Class A Ordinary Shares were authorized to be repurchased from time to time depending on market conditions or other factors through open market or privately negotiated transactions, and will be funded from available capital. During the first quarter of 2014, we repurchased 7.2 million shares at an average price per share of $83.45 for a total cost of $600 million. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is $2.3 billion.

ITEM 6.EXHIBITS

Exhibits — The exhibits filed with this report are listed on the attached Exhibit Index.

49

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Aon plc
	(Registrant)
April 25, 2014	By:	/s/ Laurel Meissner
	LAUREL MEISSNER
	SENIOR VICE PRESIDENT AND
	GLOBAL CONTROLLER
	(Principal Accounting Officer and duly authorized officer of Registrant)

50

Exhibit Index

Exhibit Number	Description of Exhibit
10.1	Aon plc Leadership Performance Program for 2014-2016
10.2	Executive Committee Incentive Compensation Plan
12.1	Statement regarding Computation of Ratio of Earnings to Fixed Charges.
31.1	Certification of CEO.
31.2	Certification of CFO.
32.1	Certification of CEO Pursuant to section 1350 of Title 18 of the United States Code.
32.2	Certification of CFO Pursuant to section 1350 of Title 18 of the United States Code.
101	Interactive Data Files. The following materials are filed electronically with this Quarterly Report on Form 10-Q:
	101.INS XBRL Report Instance Document
	101.SCH XBRL Taxonomy Extension Schema Document
	101.CAL XBRL Taxonomy Calculation Linkbase Document
	101.DEF XBRL Taxonomy Definition Linkbase Document
	101.PRE XBRL Taxonomy Presentation Linkbase Document
	101.LAB XBRL Taxonomy Calculation Linkbase Document

51

EX-10.1

AON PLC

LEADERSHIP PERFORMANCE PROGRAM

For 2014-2016

Overview

The Program has been adopted by the Committee as a sub-plan to the Stock Plan, effective as of January 1, 2014. The Program is the ninth layer of multi-year performance programs implemented by the Company. Earlier programs covered the three-year performance periods beginning on January 1 in each of 2006 through 2013 and ending on December 31 of 2008 through 2015, respectively.

Performance Cycle

The Program covers a multi-year performance cycle that begins on January 1, 2014 and ends on December 31, 2016 (“Performance Cycle”).

Eligibility

As recommended by the CEO and approved by the Committee, key members of the Company’s senior leadership team are eligible to participate in the Program. The CEO is also eligible to participate in the Program as approved by the Committee.

Participation

The Committee will approve in writing no later than May 31, 2014 the identity of the participants eligible to participate in the Program and each participant’s Award, denominated as described herein either in total number of LPP units or US dollars. Those participants so identified by May 31, 2014 shall be eligible to participate in the full Performance Cycle, retroactive to January 1, 2014.

If a participant is no longer considered a member of the Company’s senior leadership team, but the participant’s employment with the Company has not terminated, the participant’s Award under the Program shall be unaffected by the change in status.

Award Components – Performance Share Units

At the outset of participation in the Program, each participant will receive 100% of his or her Award “value” as target Performance Share Units of the Company’s ordinary shares. If the Award is denominated by the Committee in US dollars, the number of such target units will be derived by dividing the Award by the Fair Market Value of an ordinary share of the Company on the Grant Date.

Rules Applicable to Performance Share Units

1. The Performance Share Units will be earned and will vest as of the Settlement Date, subject to the satisfaction of the performance criteria set forth herein.

2. The payout resulting from the vesting of the Performance Share Units will be determined based on the Company’s cumulative adjusted Earnings per Share over the Performance Cycle as compared to the Target Earnings per Share.

3. Payouts will range from 0% to 200% of the targeted number of Performance Share Units awarded.

4. The Performance Share Units will pay out in ordinary shares of the Company issued under, and subject to, the limitations of the Stock Plan, provided that the pay out in ordinary shares shall take place in the calendar year following the end of the Performance Cycle.

1

5. The Company shall have the right to satisfy all federal, state and local withholding tax requirements with respect to the award earned by reducing the number of earned shares by the number of shares determined by dividing the amount of withholding required by the Fair Market Value of an ordinary share of the Company on the Settlement Date.

6. The Performance Share Units are not transferable and may not be sold, assigned, pledged, hypothecated or otherwise encumbered.

7. Until the Settlement Date, the participant will not be treated as a shareholder as to those ordinary shares of the Company relating to the Performance Share Units. No cash payments will be provided for dividend equivalents or other distributions.

8. The participant will be granted a Performance Award Certificate at the outset of his or her participation in the Program. The certificate will set forth the target number of Performance Share Units granted to the participant. The participant must sign and return to the Company the certificate to indicate that he or she agrees to be bound by the provisions of the Program, including the restrictive covenants described herein. Failure to return a signed certificate to the Company will result in forfeiture of the Performance Share Units.

9. If a participant’s employment with the Company terminates before the last day of the Performance Cycle, the following rules will apply to the vesting of the Performance Share Units:

Reason for Employment Termination	Impact on Vesting of Performance Share Units
Retirement or termination by Company without Cause	Performance Share Units will vest pro rata through the date of termination or Retirement, and the vested Performance Share Units will pay out in accordance with rule 4 above. The Committee’s determination regarding the vested portion and payout will occur after the close of the Performance Cycle. The number of units earned will be calculated based on the actual achievement of the Target Earnings Per Share for the performance period, and then the result will be prorated as of the last full calendar quarter as of or preceding the participant’s termination or Retirement date, as follows: Target Shares X (Adjusted EPS at end of quarter as of or preceding date of termination/ AdjustedEPS at end of performance period) X Performance Factor = Number of Pro-Rata Shares In the event a participant has an employment agreement with the Company or any of its subsidiaries providing for “good reason” termination, a termination of the participant’s employment for good reason will be treated in the same manner for purposes of this Program only as a termination by the Company without cause.
Death or Total and Permanent Disability	If death or permanent disability occurs in the first or second calendar years of the Performance Cycle, the Performance Share Units will become immediately vested at the target award level and the vested Performance Share Units will pay out as soon as administratively feasible following such death or disability. If death or permanent disability occurs in the third calendar year of the Performance Cycle, the Performance Share Units will become vested at the greater of (i) the target award level or (ii) the number of units earned based on the actual achievement of the Adjusted Earnings Per Share for the entire Performance Cycle, and the vested Performance Share Units will pay out in accordance with rule 4 above.
Voluntary Resignation	Performance Share Units will be forfeited in their entirety

2

Reason for Employment Termination	Impact on Vesting of Performance Share Units
Termination by Company for Cause	Performance Share Units will be forfeited in their entirety
Termination due to Change in Control	If a successor to the Company assumes and continues this Program substantially in its current form after a Change in Control, the Performance Share Units will be subject to the following rules: (1) if the participant’s employment is terminated by the Company without Cause after the Change in Control but prior to the end of the Performance Cycle, the participant will become immediately vested in the greater of the target Performance Share Units or the number of units that would be earned based on the proportion of achievement of the Target Earnings Per Share as of the last full calendar quarter as of or preceding the participant’s termination date, and the vested Performance Share Units will pay out in accordance with rule 4 above; and (2) if the participant’s employment is terminated by the Company for Cause, by the participant in a voluntary resignation, or by reason of the participant’s death or Total and Permanent Disability, or if the participant’s employment is continued through the end of the Performance Cycle, the rules of the Program shall continue to apply to the Performance Share Units as if the Change in Control had not occurred. If the successor to the Company does not assume and continue this Program substantially in its current form, the Performance Share Units shall become immediately vested at the greater of the target Performance Share Units or the number of units that would have been earned based on the proportion of achievement of the Target Earnings Per Share as of the last full calendar quarter as of or preceding the effective date of the Change in Control, and the vested Performance Share Units will pay out in accordance with rule 4 above.

10. Notwithstanding the rules set forth in paragraph 9 above, in the event an employment agreement or other binding arrangement between a participant and the Company provides (a) for more favorable vesting of performance share units upon termination of employment, (b) an alternate definition (such as “cause” or “retirement”), and/or (c) an alternate restrictive covenant that is specifically intended to apply to awards under this Plan, the provisions of such employment agreement or arrangement will control if such provisions are approved by the Committee on or before the Grant Date.

11. The time and form of payment of Performance Share Units shall be made in accordance with rule 4 above, provided that with respect to any payment upon the participant’s “separation from service” (as such term is defined under Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”)), the payment at such time can be characterized as a “short-term deferral” for purposes of Code Section 409A or as otherwise exempt from the provisions of Code Section 409A, or if any portion of the payment cannot be so characterized, and the participant is a “specified employee” under Code Section 409A, such portion of the payment shall be delayed until the earlier to occur of the participant’s death or the date that is six months and one day following the participant’s termination of employment (the “Delay Period”). Upon the expiration of the Delay Period, all payments delayed pursuant to this section shall be paid to the participant in accordance with rule 4 above. For purposes of the Program, the terms “retirement,” “termination of employment,” “terminated,” “termination,” and variations thereof, as used in this Program, are intended to mean a termination of employment that constitutes a “separation from service” under Code Section 409A.

3

12. The time or schedule of any payout of Performance Share Units pursuant to the terms of the Program may not be accelerated except as otherwise permitted under Code Section 409A and the guidance and Treasury regulations issued thereunder.

Performance Measure for Performance Share Units

The performance measure for the Performance Share Units will be cumulative adjusted Earnings per Share for the Performance Cycle, for which the Committee has established a target of $16.03 (the “Target Earnings Per Share” or “Target EPS”).

Following the end of the Performance Cycle, the Committee will determine in its sole discretion the payout, which determination shall be final and binding. Performance Share Units will be subject to complete forfeiture if the Company’s performance for the Performance Cycle does not meet or exceed a minimum cumulative adjusted Earnings per Share of $15.11, and the payout for performance at or above that level will be calculated as follows:

2014-2016 Cumulative Adjusted EPS	% of Targeted Units Earned
$15.11	50%
$15.61	75%
$16.11	100%
$16.33	125%
$16.55	150%
$16.77	175%
$17.31 or higher	200%

The Performance Share Units will pay out linearly between each set of data points based on relative penetration within the range and rounded to one decimal place using standard rounding rules. Any fractional Performance Share Units that result from the application of the resulting payout percent will be truncated, not rounded or otherwise paid. For example, where cumulative adjusted EPS is $16.20, the calculation would be:

[ ($16.20 - $16.11 )	/	( $16.33 – $16.11) ]	X 25%	+100 %	= 110.2%
The actual cumulative adjustedEPS less next lowest defined data point		To calculate basis for penetration in the full range above the actual lowest data point achieved.	Multiplied by the full spread of the corresponding range (125% - 100% in this case)	The achievement for the next lowest defined data point	Resulting calculation, standard rounding to one decimal place

Adjustments to Performance Measures or Results

The Committee will make appropriate adjustments to the Target Earnings per Share or the Company’s actual adjusted Earnings Per Share from continuing operations as publicly reported in the Company’s earnings release and annual Form 10-K on account of material (significant) adjustments as noted below or otherwise consistent with any amendment to the Stock Plan: change in accounting policy; gain/loss on disposition of assets or business; extraordinary legal/regulatory settlements; extraordinary market conditions; effects of natural or man-made disasters (e.g. Word Trade Center);

4

hyperinflation (e.g. >15%); foreign exchange impact, or other extraordinary, unusual or infrequently occurring items – as defined by GAAP. The form and manner of any such adjustment shall be at the sole discretion of the Committee who will consider the long-term impact of such items. By way of example, the following events will not require adjustment: change in accounting estimate; gained/lost pre-tax income from sold/acquired businesses that represent less than 5% of total pre-tax income; inflation; general tax developments; litigation costs; effects of repaying or issuing debt; effects of share buyback/issue; effects of pension plan funding; changes in benefit/incentive plans; or normal currency/interest rate fluctuations.

Nominal Value

As required under the U.K. Companies Act 2006, at the time of settlement of Awards under this Program, the Awards are subject to the Participant’s payment of a Nominal Value (as determined in the sole discretion of the Company and in accordance with such law, as amended from time to time), and such obligation may be satisfied by the Participant in any manner to be established by the Company in its sole discretion.

Restrictive Covenants

The following restrictive covenants will apply to all awards under this Program; provided, however, that if such restrictions are modified to comply with local (non-U.S.) law and are set forth in the performance award certificate issued in connection with this Program to, and accepted by, the Participant, the provisions in the performance award certificate will govern.

The Company is in the business of providing insurance brokerage, reinsurance brokerage, benefits consulting, compensation consulting, human resources consulting, managing underwriting and related services including accounting, claims management and handling, contract wording, information systems and actuarial services. An essential element of its business is the development and maintenance of personal contacts and relationships with clients. Because of these contacts and relationships, it is common for the Company’s clients to develop identification with the employee who services its insurance needs, rather than with the Company itself. The personal identification of clients of the Company with a Company employee creates potential for the employee’s appropriation of the benefits of the relationships developed with clients on behalf of and at the expense of the Company. Since the Company would suffer irreparable harm if the employee left its employ and solicited the insurance or other related business of clients of the Company, it is reasonable to protect the Company against solicitation activities by the employee for a limited period of time after the employee leaves the Company so that the Company may renew or restore its business relationship with its clients. Therefore, as consideration for participation in this Program, each participant will be bound by the following restrictive covenants:

Covenant Not to Solicit

The employee agrees and covenants that, except with the prior written consent of the Company, the employee will not for a period of two years after the end of the employment compete directly or indirectly in any way with the business of the Company. For the purposes of this covenant, “compete directly or indirectly in any way with the business of the Company” means to enter into or attempt to enter into (on the employee’s own behalf or on behalf of any other person or entity) any business relationship of the same type or kind as the business relationship which exists between the Company and its clients or customers, in which the employee was involved or had knowledge, to provide services related to the business of the Company for any individual, partnership, corporation, association or other entity who or which was a client or customer for whom the employee was the producer or on whose account the Employee worked or became familiar during the 24 months prior to the end of employment.

5

Covenant Not to Hire

The employee also agrees not to induce or attempt to induce, or to cause any person or other entity to induce or attempt to induce, any person who is an employee of the Company to leave the employ of the Company during the term of the covenant set forth above.

If the Company determines that a participant has breached any of the covenants, his or her Performance Share Units will be immediately forfeited. In the event any of the restrictive covenants set forth herein is deemed unenforceable, such as against a non-US employee, the employee agrees that the maximum period, scope or geographic area reasonable under such circumstances shall be substituted for the stated period, scope or area and that the court shall be allowed to revise the restrictions accordingly.

Assignment of IP

The employee also agrees to assign to the Company the employee’s entire right, title and interest in and to all discoveries and improvements, patentable or otherwise, trade secrets and ideas and writings and copyrightable material, which are conceived, developed, reduced to practice, or acquired by the employee (collectively “IP”) during the employee’s employment and which relate to the business of the Company or any of its affiliates, parent companies, or subsidiaries. The employee further acknowledges that all original works of authorship which are made by the employee (solely or jointly with others) within the scope of and during the period of his/her employment with the Company and which are protectable by copyright are “works made for hire”, as that term is defined in the United States Copyright Act. The employee agrees to disclose promptly, fully and in writing all such IP to the Company. The employee will upon the Company’s request, execute, acknowledge and deliver to the Company all instruments and do all other acts which are necessary or desirable to enable the Company or any of its affiliates, parent companies, or subsidiaries to file and prosecute applications for, and to acquire, maintain and enforce, all patents, trademarks, and copyrights in all countries.

Administration

It is expressly understood that the Committee has the discretionary authority to administer, construe, and make all determinations necessary or appropriate to the administration of the Program, all of which will be binding upon the participant. The Committee may delegate its authority to one or more of its members, or to one or more members of the Company’s senior management team, to offer participation in this Program to eligible individuals; provided, however, that the Committee shall not delegate its authority with respect to the participation of any officer of the Company who is subject to Section 16 of the Securities Exchange Act of 1934, as amended.The Company shall, as necessary, adopt conforming amendments to this Program as are necessary to comply with Code Section 409A.

General Provisions

All obligations of the Company under this Program with respect to payout of Awards, and the corresponding rights granted thereunder, shall be binding on any successor to the Company, whether the existence of such successor is the result of a direct or indirect purchase, merger, consolidation or other acquisition of all or substantially all of the business and/or assets of the Company.

This Program constitutes a legal document which governs all matters involved with its interpretation and administration and superseded any writing or representation inconsistent with its terms.

Reservation and Retention of Company Rights

The selection of any employee for participation in this Program will not give that participant any right to be retained in the employ of the Company. No employee will at any time have a right to be

6

selected for participation in a future performance-based incentive program despite having been selected for participation in this Program or a previous program.

Stock Plan Controls

Except as specifically provided in this Program, in the event of any inconsistency between this Program and the Stock Plan, the Stock Plan will control, but only to the extent such Stock Plan provisions do not violate the provisions of Code Section 409A.

Code Section 409A

The Company intends that this Program and the Awards granted hereunder be interpreted and construed to comply with Code Section 409A to the extent applicable thereto. Notwithstanding any provision of the Program to the contrary, the Program shall be interpreted and construed consistent with this intent, provided that the Company shall not be required to assume any increased economic burden in connection therewith. Although the Committee intends to administer the Program so that it will comply with the requirements of Code Section 409A, neither the Company nor the Committee represents or warrants that the Program will comply with Code Section 409A or any other provision of federal, state, local, or non-United States law. Neither the Company, its subsidiaries, nor their respective directors, officers, employees or advisers shall be liable to any participant (or any other individual claiming a benefit through any participant) for any tax, interest, or penalties any participant may owe as a result of compensation paid under the Program, and the Company and its subsidiaries shall have no obligation to indemnify or otherwise protect the participant from the obligation to pay any taxes pursuant to Code Section 409A.

Definitions

AdjustedEarnings per Share or AdjustedEPS: the Company’s adjustedearnings per share from continuing operations as publicly reported each quarter, and on an annual basis, in the Company’s earnings release and Form 10-K. The Committee has the sole discretion to approve an adjustment to EPS, in accordance with the adjustment criteria set forth herein.

CEO: the Company’s Chief Executive Officer.

Cause: as determined in the sole discretion of the Committee, means the participant: (A) performing a deliberate act of dishonesty, fraud, theft, embezzlement or misappropriation involving the participant’s employment with the Company, or breach of the duty of loyalty to the Company; (B) performing an act of race, sex, national origin, religion, disability, or age-based discrimination which, after investigation, counsel to the Company reasonably concludes will result in liability being imposed on the Company and/or the participant; (C) material violation of Company policies and procedures including, but not limited to, the Aon Code of Business Conduct; or (D) performing a criminal act resulting in a criminal felony charge (or equivalent offense in a non-US jurisdiction) brought against the participant or a criminal conviction of the participant (other than a conviction of a minor traffic violation).

Change in Control: means:

(1)    the acquisition by any individual, entity or group (a “Person”), including any “person” within the meaning of Section 13(d)(3) or 14(d)(2) of the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”), of beneficial ownership (within the meaning of Rule 13d-3 promulgated under the Exchange Act) of 30% or more of either (i) the then outstanding ordinary shares of Aon plc (the “Outstanding Ordinary Shares”) or (ii) the combined voting power of the then outstanding securities of Aon plc entitled to vote generally in the election of directors (the “Outstanding Voting Securities”); excluding, however, the following: (A) any acquisition

7

directly from Aon plc (excluding any acquisition resulting from the exercise of an exercise, conversion or exchange privilege unless the security being so exercised, converted or exchanged was acquired directly from Aon plc), (B) any acquisition by Aon plc, (C) any acquisition by an employee benefit plan (or related trust) sponsored or maintained by Aon plc or any corporation controlled by Aon plc, or (D) any acquisition by any corporation pursuant to a transaction which complies with clauses (i), (ii) and (iii) of subsection (3) of this Section 1(c); provided further, that for purposes of clause (B), if any Person (other than Aon plc or any employee benefit plan (or related trust) sponsored or maintained by Aon plc or any corporation controlled by Aon plc) shall become the beneficial owner of 30% or more of the Outstanding Ordinary Shares or 30% or more of the Outstanding Voting Securities by reason of an acquisition by Aon plc, and such Person shall, after such acquisition by Aon plc, become the beneficial owner of any additional shares of the Outstanding Ordinary Shares or any additional Outstanding Voting Securities and such beneficial ownership is publicly announced, such additional beneficial ownership shall constitute a Change in Control;

(2)individuals who, as of the date hereof, constitute the Board (the “Incumbent Board”) cease for any reason to constitute at least a majority of such Board; provided that any individual who becomes a director of Aon plc subsequent to the date hereof whose election, or nomination for election by the shareholders of Aon plc, was approved by the vote of at least a majority of the directors then comprising the Incumbent Board shall be deemed a member of the Incumbent Board; and provided further, that any individual who was initially elected as a director of Aon plc as a result of an actual or threatened solicitation by a Person other than the Board for the purpose of opposing a solicitation by any other Person with respect to the election or removal of directors, or any other actual or threatened solicitation of proxies or consents by or on behalf of any Person other than the Board shall not be deemed a member of the Incumbent Board;

(3)the consummation of a reorganization, merger or consolidation or sale or other disposition of all or substantially all of the assetsof Aon plc (a “Corporate Transaction”); excluding, however, a Corporate Transaction pursuant to which (i) all or substantially all of the individuals or entities who are the beneficial owners, respectively, of the Outstanding Ordinary Shares and the Outstanding Voting Securities immediately prior to such Corporate Transaction will beneficially own, directly or indirectly, more than60% of, respectively, the outstanding shares of common stock, and the combined voting power of the outstanding securities entitled to vote generally in the election of directors, as the case may be, of the corporation resulting from such Corporate Transaction (including, without limitation, a corporation which as a result of such transaction owns Aon plc or all or substantially all of Aon plc’s assets either directly or indirectly) in substantially the same proportions relative to each other as their ownership, immediately prior to such Corporate Transaction, of the Outstanding Ordinary Shares and the Outstanding Voting Securities, as the case may be, (ii) no Person (other than: Aon plc; any employee benefit plan (or related trust) sponsored or maintained by Aon plc or any corporation controlled by Aon plc; the corporation resulting from such Corporate Transaction; and any Person which beneficially owned, immediately prior to such Corporate Transaction, directly or indirectly, 30% or more of the Outstanding Ordinary Shares or the Outstanding Voting Securities, as the case may be) will beneficially own, directly or indirectly, 30% or more of, respectively, the outstanding shares of common stock of the corporation resulting from such Corporate Transaction or the combined voting power of the outstanding securities of such corporation entitled to vote generally in the election of directors and (iii) individuals who were members of the Incumbent Board will constitute at least a majority of the members of the board of directors of the corporation resulting from such Corporate Transaction; or

8

(4)the consummation of a plan of complete liquidation or dissolution of Aon plc.

Committee: the Organization and Compensation Committee of the Company’s board of directors.

Company: Aon plc, a public limited company incorporated under English law and its subsidiaries.

Fair Market Value: the per share value of the Company’s ordinary shares as determined by using the closing price of such shares as reported by the New York Stock Exchange on such date (or, if the New York Stock Exchange was not open for trading or the shares were not traded on that day, the next preceding day that the New York Stock Exchange was open for trading and ordinary shares of the Company were traded).

Grant Date: the date an Award to a participant is approved in writing by the Committee.

Program or LPP: the Leadership Performance Program, effective January 1, 2014.

Retire or Retirement: For a Participant residing outside of the European Union, the term means a voluntary termination of employment at or after the participant’s 55^th birthday. For a Participant residing in the European Union, the term means the Participant's voluntary retirement from the workforce in circumstances where the Participant intends permanently to stop carrying out compensated work and the Participant does not carry out compensated work for at least a year following the voluntary retirement. In order for a termination of a European Union based Participant to be considered a Retirement for the purposes of this Plan, the Participant must sign and complete on or before the 10^th day prior to his or her departure date a certification in a form provided by the Company attesting to the Participant's intention to retire and permanently to stop carrying out compensated work. Further, the cash value of any shares delivered to the European Union based Participant or payments made or benefits conferred on the Participant as a result of the Participant's cessation of employment being treated as a Retirement shall be immediately repayable to the Company if the certification that the Participant has given turns out to be false or the Participant carries out compensated work in the year following the voluntary retirement.  For purposes of this Plan, a reference to compensated work includes, without limitation, any compensated work carried out for any employer or other organization, any consultancy work and any work that the Participant carries out in business on his or her own account, in a partnership or in any other business.

Settlement Date: the date that the Committee determines whether the performance criteria applicable to the Performance Share Units has been achieved or exceeded and determines the payout to participants. The Settlement Date shall occur as soon as practicable following the close of the Performance Cycle.

Settlement Date Value: the Fair Market Value of an ordinary share of the Company on the date the Committee determines the amount of the Performance Share Units earned.

Stock Plan: the Aon Corporation 2011 Incentive Plan as approved by the Company’s stockholders at the 2011 annual meeting of stockholders and as assumed and adopted by Aon plc, or as subsequently amended.

Total and Permanent Disability: for (a) US employees, entitlement to long-term disability benefits under the Company’s program, as amended from time to time and (b) non-US employees, as established by applicable Company policy or as required by local law or regulations.

If a term is used but not defined, it has the meaning given such term in the Stock Plan.

9

EX-10.2

Aon plc

Executive Committee Incentive Compensation Plan

(Amended and Restated Effective January 1, 2014)

Overview

Since 2001, Aon has maintained its Omnibus Incentive Plan to encourage the highest level of performance of its executives through the establishment of quantifiable performance goals. Awards granted under the Omnibus Incentive Plan are intended to qualify as deductible “performance-based” compensation pursuant to Section 162(m) of the Code.

This Plan is a sub-plan of the Omnibus Incentive Plan and was originally adopted by the Committee effective January 1, 2008, and amended and restated from time to time thereafter. This amendment and restatement of the Plan is effective as of January 1, 2014. This Plan provides a discretionary framework regarding the funding of awards under the Omnibus Incentive Plan and provides certain terms and conditions relating to the form and timing of awards under the Omnibus Incentive Plan.

Performance Period

The Plan is based on successive calendar-year performance periods.

Eligibility

All members of Aon’s Executive Committee are eligible to participate in the Plan if they: (a) are actively employed by Aon as of the last day of the calendar year; (b) are on an approved leave of absence as of the last day of the calendar year; or (c) terminated employment on account of death or Total and Permanent Disability during the calendar year. The Committee may modify the eligibility criteria as it deems necessary or appropriate.

Award Calculation

At the beginning of each calendar year, the Committee will approve a “target incentive award” for each participant as a percentage of his or her base salary. For those participants serving international assignments, the Committee may include the participant’s foreign service allowance in the calculation of the target incentive award. The Committee will also establish corporate performance metrics applicable to the funding of incentive awards under the Plan, and those metrics may include: (1) the achievement of a specified adjusted operating income; (2) the planned growth in adjusted operating income as compare to the prior year actual adjusted operating income; and/or (3) any other factors as determined by the Committee in its sole discretion. In addition, business unit, functional and individual performance metrics may be established and assigned weights to guide the Committee in its allocation of awards to participants.

After the close of the calendar year, awards to participants will be determined in the sole discretion of the Committee and paid to participants pursuant to and contingent upon satisfaction of all conditions under the Omnibus Incentive Plan. Awards will be funded in accordance with the corporate performance criteria adopted by the Committee; provided, however, that the CEO, in his sole discretion may elect to (i) reduce funding by up to 20% of the aggregate amount of the Participants’ target incentive awards, which discretion can be exercised at any time without the necessity of Committee approval, or (ii) increase funding by up to 10% of the aggregate amount of the Participants’ target incentive awards, provided that any such increase is subject to approval by the Committee at its next regularly scheduled meeting.

Awards will be allocated in the sole discretion of the Committee taking into account, among other facts, the participants’ target incentive awards and achievement of the assigned metrics. Any resulting awards will be paid pursuant to the terms and conditions of the Omnibus Incentive Plan; provided, however, in no event will an Award be paid later than two and one-half months after the end of the

calendar year to which such award relates. In no event may an award to a participant exceed the maximum set forth in the Omnibus Incentive Plan (i.e. $10 million). In no event may an award to a participant fail to qualify as deductible “performance-based” compensation under Section 162(m) of the Code.

Payout Process

After the awards are determined by the Committee, they will be paid out partly in cash and partly in restricted stock units of Aon plc ordinary shares pursuant to the Omnibus Incentive Plan, or in such other security as may result from an adjustment to shares pursuant to Section 5.2 of the Omnibus Incentive Plan, unless Aon is contractually obligated to provide a participant’s award fully in cash.

Awards exceeding $100,000 in value will be paid 65% in cash and 35% in restricted stock units awarded pursuant to the Omnibus Incentive Plan.

The restricted stock units will be subject to the terms and conditions established by the Committee; provided, however, that they will vest in three equal installments on each of the first through third anniversaries of the date of grant. The Committee may modify the manner of distribution for an individual participant or one or more groups of participants as it deems necessary or appropriate.

A participant will have no right to an award until it is paid.

Administration

It is expressly understood that the Committee has the discretionary authority to administer, construe, and make all determinations necessary or appropriate to the administration of the Plan, all of which will be binding upon the participant. The Committee has the sole discretion to set the Target Award Percentage for each participant and to determine any final award payment taking into account factors it selects in its sole discretion including, but not limited to, the duration of a participant’s employment with the Company during the year.

Nominal Value

In order to comply with the U.K. Companies Act 2006, at the time of settlement of Awards under this Plan any portion of Awards settled in restricted stock units will be subject to the participant’s payment of a Nominal Value (as determined in the sole discretion of the Company and in accordance with the law, as amended from time to time). Such obligation may be satisfied by the participant in any manner to be established by the Company in its sole discretion.

General Provisions

This Plan constitutes a legal document which governs all matters involved with its interpretation and administration and supersedes any writing or representation inconsistent with its terms.

To the extent not preempted by federal law, this Plan will be construed in accordance with, and subject to, the laws of the state of Illinois without regard to any conflict of laws principles. Any legal action related to this Plan must be brought in a federal or state court located in Illinois.

All awards will be subject to applicable withholding taxes and other required deductions.

Participants may not assign, transfer, sell, pledge or otherwise alienate their award opportunities, other than by will or by the laws of descent and distribution. Any award payable on behalf of a deceased participant will be paid to the participant’s estate.

Aon is not required to establish a separate account or fund or to make any other segregation of its assets in connection with awards that could become payable under this Plan. Participants will have rights with regard to earned but unpaid awards that are no greater than the rights of unsecured general creditors.

This Plan and the benefits provided hereunder are intended to comply with Section 409A of the Code and the guidance and Treasury Regulations issued thereunder to the extent applicable thereto. Notwithstanding any provision of the Plan to the contrary, the Plan shall be interpreted and construed consistent with this intent. Notwithstanding the foregoing, Aon shall not be required to assume any increased economic burden in connection therewith. Although Aon intends to administer the Plan so that it will comply with the requirements of Section 409A of the Code, Aon does not represent or warrant that the Plan will comply with Section 409A of the Code or any other provision of federal, state, local, or non-United States law. Neither Aon, nor any subsidiary, nor its or their respective directors, officers, employees or advisers shall be liable to any participant (or any other individual claiming a benefit through the participant) for any tax, interest, or penalties the participant might owe as a result of participation in the Plan, and neither Aon nor any subsidiary shall have any obligation to indemnify or otherwise protect any participant from the obligation to pay any taxes pursuant to Section 409A of the Code.

Reservation and Retention of Company Rights

Participation in this Plan will not give a participant any right to be retained in the employ of Aon. No employee will at any time have a right to be selected for participation in another performance-based incentive program, including any future program, on account of his or her participation in this Plan.

All awards under this Plan are gratuitous in nature and will not become part of any employment condition or contract.

The Committee reserves the right to amend or terminate this Plan, prospectively or retroactively, at any time and for any reason.

Omnibus Incentive Plan Controls

In the event of any inconsistency between this Plan and the Omnibus Incentive Plan, the Omnibus Incentive Plan will control unless otherwise specified herein.

Definitions

“Adjusted operating income” means such term as publicly reported on an annual basis in the Company’s earnings release and Form 10-K.  For purposes of this Plan, the Committee will make appropriate adjustments to the target adjusted operating income or the Company’s actual adjusted operating income as publicly reported in the Company’s earnings release and annual Form 10-K on account of material (significant): change in accounting policy; gain/loss on disposition of assets or business; extraordinary legal/regulatory settlements; extraordinary market conditions; effects of natural or man-made disasters (e.g. World Trade Center); hyperinflation (e.g. >15%); or other extraordinary, unusual or infrequently occurring items – as defined by GAAP. The form and manner of any such adjustment shall be at the sole discretion of the Committee who will consider the long-term impact of such items.  By way of example, the following events will not require adjustment:  change in accounting estimate; gained/lost operating income from sold/acquired businesses that represent less than 5% of total operating income; inflation; general tax developments; litigation costs; effects of repaying or issuing debt; effects of share buyback/issue; effects of pension plan funding; changes in benefit/incentive plans; or normal currency/interest rate fluctuations.    For purposes of this Plan, adjusted operating income will be measured to one decimal place, and will receive straight-line interpolation between performance targets in the gearing schedule adopted by the Committee.

“Aon” means Aon plc, a public limited company incorporated under English law, and its operating subsidiaries and affiliates.

“Code” means the U.S. Internal Revenue Code of 1986, as amended.

“Committee” means the Organization and Compensation Committee of the Board of Directors of Aon.

“Executive Committee” means the committee comprised of senior members of Aon’s management team as established from time to time.

“Omnibus Incentive Plan” means the Aon Corporation 2011 Incentive Plan, as approved by the Company’s Stockholders on May 20, 2011, as adopted and assumed by Aon plc effective April 2, 2012, and as may be further amended from time to time. “Plan” means this Executive Committee Incentive Compensation Plan, as amended and restated effective January 1, 2014, which in the 2013 calendar year was referred to as the “Aon Corporation Senior Executive Incentive Compensation Plan”.

“Total and Permanent Disability” means (a) for US employees, entitlement to long-term disability benefits under Aon’s program as amended from time to time, and (b) for non-US employees, as established by applicable company policy or as required by local law or regulations.

If a term is used but not defined, it has the meaning given such term in the Omnibus Incentive Plan.

EX-12.1

Exhibit 12.1

Aon plc and Consolidated Subsidiaries

Combined With Unconsolidated Subsidiaries

Computation of Ratio of Earnings to Fixed Charges

	Three Months Ended March 31,					Years Ended December 31,
(millions except ratio)	2014			2013		2013		2012		2011		2010
Income from continuing operations before income taxes and noncontrolling interests (1)	$	414		$	368	1,538		$	1,380	$	1,388	$	1,059
Less: Equity in earnings on less than 50% owned entities	5			2		20		13		7		10
Add back fixed charges:
Interest on indebtedness	58			52		210		228		245		182
Interest on uncertain tax positions	(2		)	—		5		5		—		(1		)
Portion of rents representative of interest factor	13			10		52		42		55		48
Income as adjusted	$	478		$	428	$	1,785	$	1,642	$	1,681	$	1,278
Fixed charges:
Interest on indebtedness	$	58		$	52	$	210	$	228	$	245	$	182
Interest on uncertain tax positions	(2		)	—		5		5		—		(1		)
Portion of rents representative of interest factor	13			10		52		42		55		48
Total fixed charges	$	69		$	62	$	267	$	275	$	300	$	229
Ratio of earnings to fixed charges	6.9			6.9		6.7		6.0		5.6		5.6

(1) For the years ended December 31, 2012, and 2011 amounts related to discontinued operations have been included in Other income to conform to amounts included in the Consolidated Financial Statements. These amounts in the years ended December 31, 2012 and 2011, which were historically included in Income (loss) from discontinued operations, have been reclassified to conform with current presentation. The amounts reclassified were $1 million loss and $4 million income for the years ended December 31, 2012 and 2011, respectively, from Income (loss) from discontinued operations to Other income. For the year ended December 31, 2010, amounts related to discontinued operations remain in Income (loss) from discontinued operations as they are more meaningful to the presentation of continuing operations in that year.

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Gregory C. Case, the Chief Executive Officer of Aon plc, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aon plc;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 25, 2014	/s/ GREGORY C. CASE
		Gregory C. Case Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Christa Davies, the Chief Financial Officer of Aon plc, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aon plc;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 25, 2014	/s/ CHRISTA DAVIES
		Christa Davies Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to Section 1350 of Chapter 63

of Title 18 of the United States Code

I, Gregory C. Case, the Chief Executive Officer of Aon plc (the “Company”), certify that (i) the Quarterly Report on Form 10-Q of the Company for the quarter ended March 31, 2014 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and (ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ GREGORY C. CASE

Gregory C. Case

Chief Executive Officer

April 25, 2014

EX-32.2

Exhibit 32.2

Certification Pursuant to Section 1350 of Chapter 63

of Title 18 of the United States Code

I, Christa Davies, the Chief Financial Officer of Aon plc (the “Company”), certify that (i) the Quarterly Report on Form 10-Q of the Company for the quarter ended March 31, 2014 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and (ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ CHRISTA DAVIES

Christa Davies

Chief Financial Officer

April 25, 2014

XML

Other Financial Data Schedule of Allowance for Doubtful Accounts (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 90	$ 118
Provision charged to operations	4	10
Accounts written off, net of recoveries	(5)	(9)
Effect of exchange rate changes and other	0	3
Balance at end of period	$ 89	$ 122

XML

Shareholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (2,374)
Other comprehensive income (loss) before reclassifications, net	19
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	50
Tax benefit	(15)
Amounts reclassified from accumulated other comprehensive loss, net	35
Net current period other comprehensive (loss) income	54
Ending balance	(2,320)
Change in Fair Value of Investments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1	[1]
Other comprehensive income (loss) before reclassifications, net	1	[1]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	0	[1]
Tax benefit	0	[1]
Amounts reclassified from accumulated other comprehensive loss, net	0	[1]
Net current period other comprehensive (loss) income	1	[1]
Ending balance	2	[1]
Change in Fair Value of Derivatives [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(22)	[1]
Other comprehensive income (loss) before reclassifications, net	0	[1]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	14	[1]
Tax benefit	(5)	[1]
Amounts reclassified from accumulated other comprehensive loss, net	9	[1]
Net current period other comprehensive (loss) income	9	[1]
Ending balance	(13)	[1]
Foreign Currency Translation Adjustments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	169
Other comprehensive income (loss) before reclassifications, net	18
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	0
Tax benefit	0
Amounts reclassified from accumulated other comprehensive loss, net	0
Net current period other comprehensive (loss) income	18
Ending balance	187
Post-Retirement Benefit Obligation [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2,522)	[2]
Other comprehensive income (loss) before reclassifications, net	0	[2]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	36	[2]
Tax benefit	(10)	[2]
Amounts reclassified from accumulated other comprehensive loss, net	26	[2]
Net current period other comprehensive (loss) income	26	[2]
Ending balance	$ (2,496)	[2]

[1] Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income

[2] Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits

XML

Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013 Aon Hewitt Restructuring Plan [Member]	Mar. 31, 2013 Aon Hewitt Restructuring Plan [Member] HR Solutions [Member]	Mar. 31, 2013 Aon Hewitt Restructuring Plan [Member] Risk Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 26	$ 15	$ 11
Restructuring reserve	127	166
Cash payments	40
Foreign exchange translation	$ 1

XML

Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013
Segment Reporting Information
Number of reportable segments	2
Total revenue	$ 2,947	$ 2,915
Total commissions, fees and other revenue	2,941	2,908
Total fiduciary investment income	6	7
Operating income before income tax	469	410
Interest income	2	1
Interest expense	(58)	(52)
Other income	1	9
Income from continuing operations before income taxes	414	368
Total operating segments [Member]
Segment Reporting Information
Operating income before income tax	512	454
Risk Solutions [Member]
Segment Reporting Information
Total revenue	1,994	1,971
Total commissions, fees and other revenue	1,988	1,964
Total fiduciary investment income	6	7
Operating income before income tax	445	403
Retail brokerage
Segment Reporting Information
Total commissions, fees and other revenue	1,579	1,562
Reinsurance brokerage
Segment Reporting Information
Total commissions, fees and other revenue	409	402
HR Solutions [Member]
Segment Reporting Information
Total revenue	965	954
Total commissions, fees and other revenue	965	954
Total fiduciary investment income	0	0
Operating income before income tax	67	51
Consulting services
Segment Reporting Information
Total commissions, fees and other revenue	384	382
Outsourcing
Segment Reporting Information
Total commissions, fees and other revenue	589	581
Intrasegment
Segment Reporting Information
Total commissions, fees and other revenue	(8)	(9)
Intersegment elimination
Segment Reporting Information
Total revenue	(12)	(10)
Total commissions, fees and other revenue	(12)	(10)
Unallocated Expense
Segment Reporting Information
Operating income before income tax	$ (43)	$ (44)

XML

Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
U.K. [Member]
Defined Benefit Plan Disclosure
Service cost	$ 0	$ 0
Interest cost	58	53
Expected return on plan assets	(82)	(75)
Amortization of net actuarial loss	13	12
Net periodic (benefit) cost	(11)	(10)
Curtailment loss (gain) and other	0	0
Net periodic (benefit) cost	(11)	(10)
Estimate of contributions to defined benefit pension plans for the current fiscal year	185
Contributions made to defined benefit pension plans	65
U.S. [Member]
Defined Benefit Plan Disclosure
Service cost	0	0
Interest cost	32	28
Expected return on plan assets	(39)	(34)
Amortization of net actuarial loss	10	13
Net periodic (benefit) cost	3	7
Curtailment loss (gain) and other	1	0
Net periodic (benefit) cost	4	7
Estimate of contributions to defined benefit pension plans for the current fiscal year	173
Contributions made to defined benefit pension plans	40
Other [Member]
Defined Benefit Plan Disclosure
Service cost	0	5
Interest cost	12	11
Expected return on plan assets	(15)	(15)
Amortization of net actuarial loss	2	6
Net periodic (benefit) cost	(1)	7
Curtailment loss (gain) and other	(3)	0
Net periodic (benefit) cost	(4)	7
Estimate of contributions to defined benefit pension plans for the current fiscal year	27
Contributions made to defined benefit pension plans	$ 12

XML

Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Changes in the net carrying amount of goodwill by operating segment (in millions)
Beginning balance	$ 8,997
Goodwill related to current year acquisitions	4
Goodwill related to prior year acquisitions	(1)
Foreign currency translation	30
Ending balance	9,030
Risk Solutions [Member]
Changes in the net carrying amount of goodwill by operating segment (in millions)
Beginning balance	6,020
Goodwill related to current year acquisitions	2
Goodwill related to prior year acquisitions	(1)
Foreign currency translation	31
Ending balance	6,052
HR Solutions [Member]
Changes in the net carrying amount of goodwill by operating segment (in millions)
Beginning balance	2,977
Goodwill related to current year acquisitions	2
Goodwill related to prior year acquisitions	0
Foreign currency translation	(1)
Ending balance	$ 2,978

XML

Derivatives and Hedging (Tables)

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional and fair values of derivative instruments

The notional and fair values of derivative instruments are as follows (in millions):

	Notional Amount				Derivative Assets (1)				Derivative Liabilities (2)
	March 31, 2014		December 31, 2013		March 31, 2014		December 31, 2013		March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	172	$	171	$	9	$	9	$	—	$	—
Foreign exchange contracts	1,223		1,191		73		71		94		93
Total	1,395		1,362		82		80		94		93
Derivatives not accounted for as hedges:
Foreign exchange contracts	177		215		—		—		—		—
Total	$	1,572	$	1,577	$	82	$	80	$	94	$	93

______________________________________________

(1) Included within Other current assets ($49 million and $46 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($33 million and $34 million at March 31, 2014 and December 31, 2013, respectively)

(2) Included within Other current liabilities ($18 million and $51 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($76 million and $42 million at March 31, 2014 and December 31, 2013, respectively)

Offsetting of financial assets and derivatives assets are as follows (in millions):

	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Assets Presented in the Statement of Financial Position (1)
	March 31, 2014		December 31, 2013		March 31, 2014			December 31, 2013			March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	9	$	9	$	—		$	—		$	9	$	9
Foreign exchange contracts	73		71		(24		)	(30		)	49		41
Total	82		80		(24		)	(30		)	58		50
Derivatives not accounted for as hedges:
Foreign exchange contracts	—		—		—			—			—		—
Total	$	82	$	80	$	(24	)	$	(30	)	$	58	$	50

______________________________________________

(1) Included within Other current assets ($21 million and $18 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($37 million and $32 million at March 31, 2014 and December 31, 2013, respectively)

Offsetting of financial liabilities and derivative liabilities are as follows (in millions):

	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Liabilities Presented in the Statement of Financial Position (2)
	March 31, 2014		December 31, 2013		March 31, 2014			December 31, 2013			March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	—	$	—	$	—		$	—		$	—	$	—
Foreign exchange contracts	94		93		(24		)	(30		)	70		63
Total	94		93		(24		)	(30		)	70		63
Derivatives not accounted for as hedges:
Foreign exchange contracts	—		—		—			—			—		—
Total	$	94	$	93	$	(24	)	$	(30	)	$	70	$	63

______________________________________________

(2) Included within Other current liabilities ($18 million and $23 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($52 million and $40 million at March 31, 2014 and December 31, 2013, respectively)

Derivative gains (losses)

The amounts of derivative gains (losses) recognized in the Condensed Consolidated Financial Statements for the three months endedMarch 31, 2014 and 2013 are as follows (in millions):

	Three months ended March 31,
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	2014			2013
Cash flow hedges:
Interest rate contracts (1)	$	—		$	—
Foreign exchange contracts (2)	(8		)	(29		)
Total	$	(8	)	$	(29	)
Foreign net investment hedges:
Foreign exchange contracts	$	—		$	—

 ______________________________________________

(1) Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Interest Expense

(2) Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Compensation and benefits ($11 million and $4 million gain for the three months ended March 31, 2014 and 2013, respectively), and Other income ($19 million and $33 million loss for the three months ended March 31, 2014 and 2013, respectively)

Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	Three months ended March 31,
	2014			2013
Cash flow hedges:
Interest rate contracts (1)	$	—		$	—
Foreign exchange contracts (2)	(21		)	(11		)
Total	(21		)	(11		)
Foreign net investment hedges:
Foreign exchange contracts	$	—		$	—

 ______________________________________________

(1) Included within Interest Expense

(2) Included within Compensation and benefits ($3 million and $1 million loss for the three months ended March 31, 2014 and 2013, respectively), Other general expenses ($1 million loss for the three months ended March 31, 2013), and Other income ($18 million and $9 million loss for the three months ended March 31, 2014 and 2013, respectively)

The amount of gain (loss) recognized in the Condensed Consolidated Financial Statements is as follows (in millions):

	Three months ended March 31,
	Amount of Gain (Loss) Recognized in Income on Derivative (2)					Amount of Gain (Loss) Recognized in Income on Related Hedged Item
	2014		2013			2014		2013
Fair value hedges:
Foreign exchange contracts (1)	$	—	$	(1	)	$	—	$	1

  ______________________________________________

(1) Relates to fixed rate debt

(2) Included in Interest expense

XML

Guarantee of Registered Securities - Condensed Consolidating Statement of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 336	$ 272
Less: Net income attributable to noncontrolling interests	11	11
Net income attributable to Aon shareholders	325	261
Change in fair value of investments	1	0
Change in fair value of derivatives	9	(14)
Foreign currency translation adjustments	16	(174)
Post-retirement benefit obligation	26	23
Total other comprehensive income (loss)	52	(165)
Equity in other comprehensive loss of subsidiaries, net of tax	0	0
Less: Other comprehensive income attributable to noncontrolling interests	(2)	0
Total other comprehensive income (loss) attributable to Aon shareholders	54	(165)
Comprehensive income attributable to Aon shareholders	379	96
Aon plc [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	325	261
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to Aon shareholders	325	261
Change in fair value of investments	0	0
Change in fair value of derivatives	0	0
Foreign currency translation adjustments	0	0
Post-retirement benefit obligation	0	0
Total other comprehensive income (loss)	0	0
Equity in other comprehensive loss of subsidiaries, net of tax	54	(165)
Less: Other comprehensive income attributable to noncontrolling interests	0	0
Total other comprehensive income (loss) attributable to Aon shareholders	54	(165)
Comprehensive income attributable to Aon shareholders	379	96
Aon Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	200	247
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to Aon shareholders	200	247
Change in fair value of investments	0	0
Change in fair value of derivatives	1	1
Foreign currency translation adjustments	(17)	(8)
Post-retirement benefit obligation	6	7
Total other comprehensive income (loss)	(10)	0
Equity in other comprehensive loss of subsidiaries, net of tax	69	(164)
Less: Other comprehensive income attributable to noncontrolling interests	0	0
Total other comprehensive income (loss) attributable to Aon shareholders	59	(164)
Comprehensive income attributable to Aon shareholders	259	83
Other Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	354	300
Less: Net income attributable to noncontrolling interests	11	11
Net income attributable to Aon shareholders	343	289
Change in fair value of investments	1	0
Change in fair value of derivatives	8	(15)
Foreign currency translation adjustments	33	(166)
Post-retirement benefit obligation	20	16
Total other comprehensive income (loss)	62	(165)
Equity in other comprehensive loss of subsidiaries, net of tax	0	0
Less: Other comprehensive income attributable to noncontrolling interests	(2)	0
Total other comprehensive income (loss) attributable to Aon shareholders	64	(165)
Comprehensive income attributable to Aon shareholders	407	124
Consolidating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	(543)	(536)
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to Aon shareholders	(543)	(536)
Change in fair value of investments	0	0
Change in fair value of derivatives	0	0
Foreign currency translation adjustments	0	0
Post-retirement benefit obligation	0	0
Total other comprehensive income (loss)	0	0
Equity in other comprehensive loss of subsidiaries, net of tax	(123)	329
Less: Other comprehensive income attributable to noncontrolling interests	0	0
Total other comprehensive income (loss) attributable to Aon shareholders	(123)	329
Comprehensive income attributable to Aon shareholders	$ (666)	$ (207)

XML

Share-Based Compensation Plans Restricted share unit activity (Details) (Restricted share units (RSUs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Restricted share units (RSUs) [Member]
Non-vested share awards (in shares)
Non-vested at beginning of period	9,759		10,432
Granted	1,146		1,764
Vested	(1,950)		(2,080)
Forfeited	(125)		(128)
Non-vested at end of period	8,830		9,988
Weighted Average Fair value (in dollars per share)
Non-vested at beginning of period	$ 51	[1]	$ 44	[1]
Granted	$ 83	[1]	$ 60	[1]
Vested	$ 51	[1]	$ 46	[1]
Forfeited	$ 50	[1]	$ 44	[1]
Non-vested at end of period	$ 56	[1]	$ 47	[1]

[1] Represents per share weighted average fair value of award at date of grant

XML

Guarantee of Registered Securities (Narrative) (Details)	Mar. 31, 2014
Aon plc [Member]
Condensed Financial Statements, Captions [Line Items]
Parent company's percentage ownership of guarantors	100.00%
3.50% senior notes due September 2015 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	3.50%
3.125% Senior notes due 2016 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	3.125%
5.00% Senior notes due September 2020 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	5.00%
8.205% Junior subordinated deferrable interest debentures due January 2027 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	8.205%
6.25% Senior notes due September 2040 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	6.25%
4.250% Senior notes due 2042 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	4.25%
4.45% notes due 2043 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	4.45%
4.00% notes due 2023 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	4.00%

XML

Guarantee of Registered Securities

3 Months Ended

Mar. 31, 2014

Guarantee of Registered Securities [Abstract]

Guarantee of Registered Securities

Guarantee of Registered Securities

As described in Note 16, in connection with the Redomestication, Aon plc entered into various agreements pursuant to which it agreed to guarantee the obligations of Aon Corporation arising under issued and outstanding debt securities. Aon Corporation is a 100% directly owned subsidiary of Aon plc. The debt securities that are subject to Rule 3-10 of Regulation S-X are the 3.50% senior notes due September 2015, the 3.125% senior notes due May 2016, the 5.00% senior notes due September 2020, the 8.205% junior subordinated deferrable interest debentures due January 2027 and the 6.25% senior notes due September 2040. All guarantees of Aon plc are full and unconditional. There are no other subsidiaries of Aon plc that are guarantors of the debt.

Aon Corporation entered into an agreement pursuant to which it agreed to guarantee the obligations of Aon plc arising under the 4.250% Notes Due 2042 exchanged for Aon Corporation's outstanding 8.205% junior subordinated deferrable interest debentures due January 2027 in both Original Notes and Exchange Notes form. Those notes are subject to Rule 3-10 of Regulation S-X. Aon Corporation also agreed to guarantee the obligations of Aon plc arising under the 4.45% Notes Due 2043 issued on May 21, 2013 and the 4.00% Notes Due November 2023 issued on November 21, 2013. In each case, the guarantee of Aon Corporation is full and unconditional. There are no subsidiaries of Aon plc, other than Aon Corporation, that are guarantors of the 4.250% Notes Due 2042, the 4.45% Notes Due 2043 or the 4.00% Notes Due 2023.

The following tables set forth condensed consolidating statements of income for the three months endedMarch 31, 2014 and 2013, condensed consolidating statements of comprehensive income for the three months endedMarch 31, 2014 and 2013, condensed consolidating statements of financial position as of March 31, 2014 and December 31, 2013, and condensed consolidating statements of cash flows for the three months ended March 31, 2014 and 2013 in accordance with Rule 3-10 of Regulation S-X. The condensed consolidating financial information includes the accounts of Aon plc, the accounts of Aon Corporation, and the combined accounts of the non-guarantor subsidiaries. The condensed consolidating financial statements are presented in all periods as a merger under common control, with Aon plc presented as the parent company in all periods prior and subsequent to the Redomestication. The principal consolidating adjustments are to eliminate the investment in subsidiaries and intercompany balances and transactions.

In July 2013, Aon Holdings LLC, an intermediate holding company and the then-direct parent of Aon Corporation, transferred its ownership of Aon Corporation to Aon plc via distribution. The financial results of Aon Holdings LLC were included in the Other Non-Guarantor Subsidiaries column of the Condensed Consolidating Financial Statements. The Company has reflected the transfer of Aon Corporation from Aon Holdings LLC to Aon plc below for all periods presented.

Condensed Consolidating Statement of Income

	Three months ended March 31, 2014
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,940		$	—		$	2,941
Fiduciary investment income	—			—			6			—			6
Total revenue	1			—			2,946			—			2,947
Expenses
Compensation and benefits	12			8			1,731			—			1,751
Other general expenses	7			17			703			—			727
Total operating expenses	19			25			2,434			—			2,478
Operating (loss) income	(18		)	(25		)	512			—			469
Interest income	(2		)	—			4			—			2
Interest expense	(9		)	(31		)	(18		)	—			(58		)
Intercompany interest income (expense)	111			(74		)	(37		)	—			—
Other income	—			—			1			—			1
Income (loss) before taxes	82			(130		)	462			—			414
Income tax (benefit) expense	20			(50		)	108			—			78
Income (loss) before equity in earnings of subsidiaries	62			(80		)	354			—			336
Equity in earnings of subsidiaries, net of tax	263			280			—			(543		)	—
Net income	325			200			354			(543		)	336
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	325		$	200		$	343		$	(543	)	$	325

Condensed Consolidating Statement of Income

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,907		$	—		$	2,908
Fiduciary investment income	—			—			7			—			7
Total revenue	1			—			2,914			—			2,915
Expenses
Compensation and benefits	11			15			1,699			—			1,725
Other general expenses	7			6			767			—			780
Total operating expenses	18			21			2,466			—			2,505
Operating (loss) income	(17		)	(21		)	448			—			410
Interest income	—			1			—			—			1
Interest expense	(2		)	(34		)	(16		)	—			(52		)
Intercompany interest (expense) income	(7		)	43			(36		)	—			—
Other (expense) income	—			(1		)	10			—			9
(Loss) income before taxes	(26		)	(12		)	406			—			368
Income tax (benefit) expense	(5		)	(5		)	106			—			96
(Loss) income before equity in earnings of subsidiaries	(21		)	(7		)	300			—			272
Equity in earnings of subsidiaries, net of tax	282			254			—			(536		)	—
Net income	261			247			300			(536		)	272
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	261		$	247		$	289		$	(536	)	$	261

Condensed Consolidating Statement of Comprehensive Income

	Three months ended March 31, 2014
						Other
	Aon		Aon			Non-Guarantor			Consolidating
(millions)	plc		Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	325	$	200		$	354		$	(543	)	$	336
Less: Net income attributable to noncontrolling interests	—		—			11			—			11
Net income attributable to Aon shareholders	$	325	$	200		$	343		$	(543	)	$	325
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—		—			1			—			1
Change in fair value of derivatives	—		1			8			—			9
Foreign currency translation adjustments	—		(17		)	33			—			16
Post-retirement benefit obligation	—		6			20			—			26
Total other comprehensive income	—		(10		)	62			—			52
Equity in other comprehensive loss of subsidiaries, net of tax	54		69			—			(123		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—			(2		)	—			(2		)
Total other comprehensive income attributable to Aon shareholders	54		59			64			(123		)	54
Comprehensive income attributable to Aon shareholders	$	379	$	259		$	407		$	(666	)	$	379

Condensed Consolidating Statement of Comprehensive Income

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	261		$	247		$	300		$	(536	)	$	272
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	261		$	247		$	289		$	(536	)	$	261
Other comprehensive income (loss), net of tax:
Change in fair value of investments	—			—			—			—			—
Change in fair value of derivatives	—			1			(15		)	—			(14		)
Foreign currency translation adjustments	—			(8		)	(166		)	—			(174		)
Post-retirement benefit obligation	—			7			16			—			23
Total other comprehensive income	—			—			(165		)	—			(165		)
Equity in other comprehensive income of subsidiaries, net of tax	(165		)	(164		)	—			329			—
Less: Other comprehensive income attributable to noncontrolling interests	—			—			—			—			—
Total other comprehensive income attributable to Aon shareholders	(165		)	(164		)	(165		)	329			(165		)
Comprehensive income attributable to Aon Shareholders	$	96		$	83		$	124		$	(207	)	$	96

Condensed Consolidating Statement of Financial Position

	As of March 31, 2014
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	—	$	154	$	1,372	$	(1,188	)	$	338
Short-term investments	—		101		239		—			340
Receivables, net	—		1		2,879		—			2,880
Fiduciary assets	—		—		12,038		—			12,038
Intercompany receivables	116		3,982		5,878		(9,976		)	—
Other current assets	—		109		538		(70		)	577
Total Current Assets	116		4,347		22,944		(11,234		)	16,173
Goodwill	—		—		9,030		—			9,030
Intangible assets, net	—		—		2,500		—			2,500
Fixed assets, net	—		—		785		—			785
Investments	—		69		74		—			143
Intercompany receivables	7,166		2,163		2,201		(11,530		)	—
Other non-current assets	146		509		1,477		(686		)	1,446
Investment in subsidiary	4,979		12,165		—		(17,144		)	—
TOTAL ASSETS	$	12,407	$	19,253	$	39,011	$	(40,594	)	$	30,077
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	12,038	$	—		$	12,038
Short-term debt and current portion of long-term debt	227		140		710		—			1,077
Accounts payable and accrued liabilities	1,218		41		1,428		(1,188		)	1,499
Intercompany payables	87		5,834		4,055		(9,976		)	—
Other current liabilities	33		47		957		(70		)	967
Total Current Liabilities	1,565		6,062		19,188		(11,234		)	15,581
Long-term debt	792		2,516		361		—			3,669
Pension, other post-retirement and other post-employment liabilities	—		930		643		—			1,573
Intercompany payables	2,100		7,267		2,163		(11,530		)	—
Other non-current liabilities	4		112		1,818		(686		)	1,248
TOTAL LIABILITIES	4,461		16,887		24,173		(23,450		)	22,071
TOTAL AON SHAREHOLDERS’ EQUITY	7,946		2,366		14,778		(17,144		)	7,946
Noncontrolling interests	—		—		60		—			60
TOTAL EQUITY	7,946		2,366		14,838		(17,144		)	8,006
TOTAL LIABILITIES AND EQUITY	$	12,407	$	19,253	$	39,011	$	(40,594	)	$	30,077

Condensed Consolidating Statement of Financial Position

	As of December 31, 2013
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	—	$	247	$	1,246	$	(1,016	)	$	477
Short-term investments	—		163		360		—			523
Receivables, net	—		4		2,892		—			2,896
Fiduciary assets	—		—		11,871		—			11,871
Intercompany receivables	186		3,503		5,452		(9,141		)	—
Other current assets	—		69		513		(19		)	563
Total Current Assets	186		3,986		22,334		(10,176		)	16,330
Goodwill	—		—		8,997		—			8,997
Intangible assets, net	—		—		2,578		—			2,578
Fixed assets, net	—		—		791		—			791
Investments	—		57		75		—			132
Intercompany receivables	7,166		2,178		2,201		(11,545		)	—
Other non-current assets	146		560		1,421		(704		)	1,423
Investment in subsidiary	4,607		11,694		—		(16,301		)	—
TOTAL ASSETS	$	12,105	$	18,475	$	38,397	$	(38,726	)	$	30,251
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	11,871	$	—		$	11,871
Short-term debt and current portion of long-term debt	—		—		707		(4		)	703
Accounts payable and accrued liabilities	1,036		62		1,849		(1,016		)	1,931
Intercompany payables	15		5,449		3,677		(9,141		)	—
Other current liabilities	12		47		866		(19		)	906
Total Current Liabilities	1,063		5,558		18,970		(10,180		)	15,411
Long-term debt	792		2,512		378		4			3,686
Pension, other post-retirement and other post-employment liabilities	—		925		682		—			1,607
Intercompany payables	2,100		7,267		2,178		(11,545		)	—
Other non-current liabilities	5		159		1,892		(704		)	1,352
TOTAL LIABILITIES	3,960		16,421		24,100		(22,425		)	22,056
TOTAL AON SHAREHOLDERS’ EQUITY	8,145		2,054		14,247		(16,301		)	8,145
Noncontrolling interests	—		—		50		—			50
TOTAL EQUITY	8,145		2,054		14,297		(16,301		)	8,195
TOTAL LIABILITIES AND EQUITY	$	12,105	$	18,475	$	38,397	$	(38,726	)	$	30,251

Condensed Consolidating Statement of Cash Flows

	Three months ended March 31, 2014
	Aon			Aon			Other Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	89		$	(123	)	$	23		$	—		$	(11	)
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			37			5			—			42
Purchase of long-term investments	—			(10		)	—			—			(10		)
Net sales of short-term investments - non-fiduciary	—			62			121			—			183
Acquisition of businesses, net of cash acquired	—			—			(5		)	—			(5		)
Proceeds from sale of businesses	—			—			1			—			1
Capital expenditures	—			—			(55		)	—			(55		)
CASH PROVIDED BY INVESTING ACTIVITIES	—			89			67			—			156
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(600		)	—			—			—			(600		)
Advances from (to) affiliates	313			(206		)	65			(172		)	—
Issuance of shares for employee benefit plans	26			—			—			—			26
Issuance of debt	293			902			—			—			1,195
Repayment of debt	(68		)	(755		)	(6		)	—			(829		)
Cash dividends to shareholders	(53		)	—			—			—			(53		)
Purchase of shares from noncontrolling interests	—			—			1			—			1
Dividends paid to noncontrolling interests	—			—			—			—			—
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(89		)	(59		)	60			(172		)	(260		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			(24		)	—			(24		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	—			(93		)	126			(172		)	(139		)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	—			247			1,246			(1,016		)	477
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	154		$	1,372		$	(1,188	)	$	338

Condensed Consolidating Statement of Cash Flows

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	5		$	(23	)	$	72		$	—		$	54
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			1			17			—			18
Purchase of long-term investments	—			(3		)	—			—			(3		)
Net (purchases) sales of short-term investments - non-fiduciary	—			(39		)	23			—			(16		)
Acquisition of businesses, net of cash acquired	—			—			(2		)	—			(2		)
Proceeds from sale of businesses	—			—			1			—			1
Capital expenditures	—			—			(60		)	—			(60		)
CASH USED FOR INVESTING ACTIVITIES	—			(41		)	(21		)	—			(62		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(300		)	—			—			—			(300		)
Advances from (to) affiliates	96			(206		)	71			39			—
Issuance of shares for employee benefit plans	36			—			—			—			36
Issuance of debt	87			833			230			—			1,150
Repayment of debt	—			(511		)	(204		)	—			(715		)
Cash dividends to shareholders	(50		)	—			—			—			(50		)
Purchase of shares from noncontrolling interests	—			—			(1		)	—			(1		)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(131		)	116			96			39			120
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			5			—			5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(126		)	52			152			39			117
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	131			199			—			(39		)	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	5		$	251		$	152		$	—		$	408

XML

Debt (Details) (Commercial paper [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Commercial paper [Member]
Debt Instrument
Total debt	$ 374	$ 0
Weighted average commercial paper outstanding	$ 204
Weighted-average interest rates (as a percent)	0.32%

XML

Other Financial Data Schedule of Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Financial Data [Abstract]
Deferred revenue	$ 513	$ 475
Taxes payable	140	136
Deferred tax liabilities	53	48
Other	261	247
Other Liabilities, Current	$ 967	$ 906

XML

Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$ (11)	$ 54
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	42	18
Purchases of long-term investments	(10)	(3)
Net sales of short-term investments - non-fiduciary	183	(16)
Acquisition of businesses, net of cash acquired	(5)	(2)
Proceeds from sale of businesses	1	1
Capital expenditures	(55)	(60)
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	156	(62)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(600)	(300)
Advances from (to) affiliates	0	0
Issuance of shares for employee benefit plans	26	36
Issuance of debt	1,195	1,150
Repayment of debt	(829)	(715)
Cash dividends to shareholders	(53)	(50)
Purchase of shares from noncontrolling interests	1	(1)
Dividends paid to noncontrolling interests	0
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(260)	120
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(24)	5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(139)	117
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	477	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	338	408
Aon plc [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	89	5
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	0	0
Purchases of long-term investments	0	0
Net sales of short-term investments - non-fiduciary	0	0
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of businesses	0	0
Capital expenditures	0	0
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	0	0
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(600)	(300)
Advances from (to) affiliates	313	96
Issuance of shares for employee benefit plans	26	36
Issuance of debt	293	87
Repayment of debt	(68)	0
Cash dividends to shareholders	(53)	(50)
Purchase of shares from noncontrolling interests	0	0
Dividends paid to noncontrolling interests	0
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(89)	(131)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	0	(126)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0	131
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0	5
Aon Corporation [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	(123)	(23)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	37	1
Purchases of long-term investments	(10)	(3)
Net sales of short-term investments - non-fiduciary	62	(39)
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of businesses	0	0
Capital expenditures	0	0
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	89	(41)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	(206)	(206)
Issuance of shares for employee benefit plans	0	0
Issuance of debt	902	833
Repayment of debt	(755)	(511)
Cash dividends to shareholders	0	0
Purchase of shares from noncontrolling interests	0	0
Dividends paid to noncontrolling interests	0
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(59)	116
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(93)	52
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	247	199
CASH AND CASH EQUIVALENTS AT END OF PERIOD	154	251
Other Non-Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	23	72
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	5	17
Purchases of long-term investments	0	0
Net sales of short-term investments - non-fiduciary	121	23
Acquisition of businesses, net of cash acquired	(5)	(2)
Proceeds from sale of businesses	1	1
Capital expenditures	(55)	(60)
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	67	(21)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	65	71
Issuance of shares for employee benefit plans	0	0
Issuance of debt	0	230
Repayment of debt	(6)	(204)
Cash dividends to shareholders	0	0
Purchase of shares from noncontrolling interests	1	(1)
Dividends paid to noncontrolling interests	0
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	60	96
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(24)	5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	126	152
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,246	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,372	152
Consolidating Adjustments [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	0	0
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	0	0
Purchases of long-term investments	0	0
Net sales of short-term investments - non-fiduciary	0	0
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of businesses	0	0
Capital expenditures	0	0
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	0	0
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	(172)	39
Issuance of shares for employee benefit plans	0	0
Issuance of debt	0	0
Repayment of debt	0	0
Cash dividends to shareholders	0	0
Purchase of shares from noncontrolling interests	0	0
Dividends paid to noncontrolling interests	0
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(172)	39
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(172)	39
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	(1,016)	(39)
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ (1,188)	$ 0

XML

Cash and Cash Equivalents (Details) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2014 GBP (£)	Dec. 31, 2013 USD ($)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Short-term investment, minimum maturity period	3 months	3 months
Short-term investment, maximum maturity period	1 year	1 year
Operating funds in U.K.	$ 128	£ 77	$ 126
Cash and cash equivalents, restricted	$ 125		$ 88

XML

Shareholders' Equity (Details) (USD $)	1 Months Ended	3 Months Ended				24 Months Ended
	Apr. 30, 2012	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014
Common Stock Programs
Total cost of shares purchased		$ 600,000,000
Weighted average shares outstanding
Shares for basic earnings per share (in shares)		303,500,000	[1]	316,400,000	[1]
Common stock equivalents (in shares)		3,700,000		3,600,000
Shares for diluted earnings per share (in shares)		307,200,000		320,000,000
Number of participating securities (in shares)		3,400,000		4,200,000
Number of shares excluded from the calculation of diluted earnings per share		0		200,000
2012 - Share Repurchase Program [Member]
Common Stock Programs
Share repurchase authorization limit	5,000,000,000
Shares purchased (in shares)		7,200,000		5,000,000		43,500,000
Average price per share of stock repurchased		$ 83.45		$ 59.82
Total cost of shares purchased		600,000,000		300,000,000		2,700,000,000
Share repurchase, remaining authorization limit		$ 2,300,000,000

[1] Includes 3.4 million and 4.2 million of participating securities for the three months ended March 31, 2014 and 2013, respectively

XML

Fair Value Measurements and Financial Instruments Schedule of assets and liabilities that are measured at fair value on a recurring basis (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Money market funds and highly liquid debt securities		Dec. 31, 2013 Recurring [Member] Fair Value [Member] Money market funds and highly liquid debt securities		Mar. 31, 2014 Recurring [Member] Fair Value [Member] Money market funds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Money market funds [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Highly liquid debt securities [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Highly liquid debt securities [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Corporate bonds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Corporate bonds [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Government bonds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Government bonds [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Equity securities [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Equity securities [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Interest rate contracts [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Interest rate contracts [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member]	Mar. 31, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities		Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities		Mar. 31, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member]	Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member]	Mar. 31, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member]	Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member]	Mar. 31, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member]	Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member]	Mar. 31, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member]	Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member]	Mar. 31, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member]	Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member]	Mar. 31, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities		Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities		Mar. 31, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member]	Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member]	Mar. 31, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member]	Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member]	Mar. 31, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member]	Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member]	Mar. 31, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member]	Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member]	Mar. 31, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member]	Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member]	Mar. 31, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities		Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities		Mar. 31, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member]	Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member]	Mar. 31, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member]	Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member]	Mar. 31, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member]	Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member]	Mar. 31, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member]	Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member]	Mar. 31, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member]	Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member]
Fair Value Disclosures [Abstract]
Net assets value (in dollar per share)	$ 1
Assets:
Money market funds and highly liquid debt securities		$ 2,086	[1]	$ 2,079	[2]	$ 2,061	$ 2,054	$ 25	$ 25											$ 2,061	[1]	$ 2,054	[2]											$ 25	[1]	$ 25	[2]											$ 0	[1]	$ 0	[2]
Other investments										1	2	7	7	15	13									0	0	0	0	6	6									0	0	7	7	9	7									1	2	0	0	0	0
Derivatives																9	9	73	71											0	0	0	0											9	9	73	71											0	0	0	0
Liabilities:
Derivatives																		$ 94	$ 93													$ 0	$ 0													$ 94	$ 93													$ 0	$ 0

[1] Includes $2,061 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 “Investments” for additional information regarding the Company’s investments.

[2] Includes $2,054 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 “Investments” for additional information regarding the Company’s investments.

XML

Share-Based Compensation Plans Stock Option Narrative (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing share price (in dollars per share)	$ 84.28
Aggregate intrinsic value of options outstanding	$ 159
Aggregate intrinsic value of exercisable options outstanding	154
Unamortized deferred compensation expense	$ 365
Remaining weighted-average amortization period	2 years
Share options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual life	2 years	2 years 6 months

XML

Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Goodwill and Intangible Assets
Tradenames	$ 1,019		$ 1,019
Intangible assets with finite lives
Intangible assets with finite lives, Gross Carrying Amount	4,335		4,323
Intangible assets with finite lives, Accumulated Amortization	1,835		1,745
Intangible assets, Net Carrying Amount	2,500		2,578
Amortization expense on intangible assets	86	99
Estimated amortization for intangible assets
Remainder of 2014	260
2015	295
2016	247
2017	200
2018	140
Thereafter	339
Estimated future amortization for intangible assets	1,481
Risk Solutions [Member]
Estimated amortization for intangible assets
Remainder of 2014	77
2015	83
2016	70
2017	59
2018	47
Thereafter	89
Estimated future amortization for intangible assets	425
HR Solutions [Member]
Estimated amortization for intangible assets
Remainder of 2014	183
2015	212
2016	177
2017	141
2018	93
Thereafter	250
Estimated future amortization for intangible assets	1,056
Customer related and contract based [Member]
Intangible assets with finite lives
Intangible assets with finite lives, Gross Carrying Amount	2,729		2,720
Intangible assets with finite lives, Accumulated Amortization	1,386		1,310
Intangible assets, Net Carrying Amount	1,343		1,410
Marketing, technology and other [Member]
Intangible assets with finite lives
Intangible assets with finite lives, Gross Carrying Amount	587		584
Intangible assets with finite lives, Accumulated Amortization	449		435
Intangible assets, Net Carrying Amount	$ 138		$ 149

XML

Accounting Principles and Practices

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Accounting Principles and Practices

Accounting Principles and Practices

Changes in Accounting Principles

Discontinued Operations

In April 2014, the Financial Accounting Standards Board ("FASB") issued new accounting guidance that increased the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. The guidance is effective for Aon in the first quarter of 2015. The adoption of this guidance is not expected to have a material impact on the Company's Condensed Consolidated Financial Statements.

Presentation of Unrecognized Tax Benefits

In July 2013, the FASB issued guidance on the presentation of certain unrecognized tax benefits on the financial statements. The guidance requires, unless certain conditions exist, an unrecognized tax benefit to be presented as a reduction to a deferred tax asset in the financial statements for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The guidance is effective for Aon in the first quarter of 2014. The adoption of this guidance did not have a material impact on the Company's Condensed Consolidated Financial Statements.

Foreign Currency

In March 2013, the FASB issued new accounting guidance clarifying the accounting for the release of cumulative translation adjustment into net income when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The guidance is effective for Aon in the first quarter of 2014. The adoption of this guidance did not have a material impact on the Company's Condensed Consolidated Financial Statements.

XML

Share-Based Compensation Plans Other information related to the company's share options (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Aggregate intrinsic value of stock options exercised	$ 21	$ 17
Cash received from the exercise of stock options	14	20
Tax benefit realized from the exercise of stock options	$ 6	$ 3

XML

Other Financial Data Schedule of Other Non-current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Financial Data [Abstract]
Deferred tax liabilities	$ 365	$ 420
Leases	201	204
Taxes payable	194	184
Deferred revenue	128	134
Compensation and benefits	59	105
Other	301	305
Other Liabilities, Noncurrent	$ 1,248	$ 1,352

XML

Investments (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of interest bearing assets

The Company’s interest-bearing assets and other investments are included in the following categories in the Condensed Consolidated Statements of Financial Position (in millions):

	March 31, 2014		December 31, 2013
Cash and cash equivalents	$	338	$	477
Short-term investments	340		523
Fiduciary assets (1)	4,088		3,778
Investments	143		132
	$	4,909	$	4,910

  ______________________________________________

(1) Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

Schedule of investments

The Company’s investments are as follows (in millions):

	March 31, 2014		December 31, 2013
Equity method investments	$	127	$	113
Other investments	8		10
Fixed-maturity securities	8		9
	$	143	$	132

XML

Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in the net carrying amount of goodwill by operating segment

The changes in the net carrying amount of goodwill by reportable segment for the three months ended March 31, 2014 is as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of December 31, 2013	$	6,020		$	2,977		$	8,997
Goodwill related to current year acquisitions	2			2			4
Goodwill related to prior year acquisitions	(1		)	—			(1		)
Foreign currency translation	31			(1		)	30
Balance as of March 31, 2014	$	6,052		$	2,978		$	9,030

Schedule of other intangible assets by asset class

Other intangible assets by asset class are as follows (in millions):

	March 31, 2014						December 31, 2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets with indefinite lives:
Tradenames	$	1,019	$	—	$	1,019	$	1,019	$	—	$	1,019
Intangible assets with finite lives:
Customer related and contract based	2,729		1,386		1,343		2,720		1,310		1,410
Marketing, technology and other	587		449		138		584		435		149
	$	4,335	$	1,835	$	2,500	$	4,323	$	1,745	$	2,578

Schedule of estimated future amortization expense on intangible assets

The estimated future amortization for finite lived intangible assets as of March 31, 2014 is as follows (in millions):

	Risk Solutions		HR Solutions		Total
Remainder of 2014	$	77	$	183	$	260
2015	83		212		295
2016	70		177		247
2017	59		141		200
2018	47		93		140
Thereafter	89		250		339
	$	425	$	1,056	$	1,481

XML

Share-Based Compensation Plans Share-based compensation expenses recognized (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 102	$ 69
Restricted share units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	60	55
Performance share awards (“PSAs”) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	39	11
Share options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	0	1
Employee share purchase plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 3	$ 2

XML

Acquisitions and Dispositions - Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 business	Mar. 31, 2013 business	Dec. 31, 2013
Intangible assets:
Goodwill	$ 9,030		$ 8,997
Business Acquisition 1 [Member]
Business Acquisition
Consideration	5	2
Intangible assets:
Goodwill	4	2
Other intangible assets	4	1
Total	8	3
Risk Solutions [Member]
Business Acquisition
Number of business acquired under business combination	1
Intangible assets:
Goodwill	6,052		6,020
HR Solutions [Member]
Business Acquisition
Number of business acquired under business combination	1	1
Intangible assets:
Goodwill	$ 2,978		$ 2,977

XML

Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Schedule of components of weighted average number of shares

Weighted average shares outstanding are as follows (in millions):

	Three months ended March 31,
	2014	2013
Shares for basic earnings per share (1)	303.5	316.4
Common stock equivalents	3.7	3.6
Shares for diluted earnings per share	307.2	320.0

   ______________________________________________

(1) Includes 3.4 million and 4.2 million of participating securities for the three months ended March 31, 2014 and 2013, respectively.

Components of Accumulated other comprehensive loss, net of related tax

Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):

	Change in Fair Value of Investments (1)		Change in Fair Value of Derivatives (1)			Foreign Currency Translation Adjustments		Post-Retirement Benefit Obligation (2)			Total
Balance at December 31, 2013	$	1	$	(22	)	$	169	$	(2,522	)	$	(2,374	)
Other comprehensive income (loss) before reclassifications, net	1		—			18		—			19
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	—		14			—		36			50
Tax benefit	—		(5		)	—		(10		)	(15		)
Amounts reclassified from accumulated other comprehensive loss, net	—		9			—		26			35
Net current period other comprehensive (loss) income	1		9			18		26			54
Balance at March 31, 2014	$	2	$	(13	)	$	187	$	(2,496	)	$	(2,320	)

______________________________________________

(1) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income

(2) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits

XML

Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2014

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost for the pension plans

The following table provides the components of the net periodic benefit cost for Aon’s material U.K., U.S., and other significant international pension plans, which are located in the Netherlands and Canada (in millions):

	Three months ended March 31,
	U.K.						U.S.						Other
	2014			2013			2014			2013			2014			2013
Service cost	$	—		$	—		$	—		$	—		$	—		$	5
Interest cost	58			53			32			28			12			11
Expected return on plan assets	(82		)	(75		)	(39		)	(34		)	(15		)	(15		)
Amortization of net actuarial loss	13			12			10			13			2			6
Net periodic (benefit) cost	(11		)	(10		)	3			7			(1		)	7
Curtailment loss (gain) and other	—			—			1			—			(3		)	—
Total net periodic benefit cost	$	(11	)	$	(10	)	$	4		$	7		$	(4	)	$	7

XML

Basis of Presentation

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements and Notes thereto have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).  The Condensed Consolidated Financial Statements include the accounts of Aon plc and all controlled subsidiaries (“Aon” or the “Company”).  All intercompany accounts and transactions have been eliminated.  The Condensed Consolidated Financial Statements include, in the opinion of management, all adjustments (consisting of normal recurring adjustments and reclassifications) necessary to present fairly the Company’s consolidated financial position, results of operations and cash flows for all periods presented.

Certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted.  These Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.  The results for the three months endedMarch 31, 2014 are not necessarily indicative of operating results that may be expected for the full year ending December 31, 2014.

Use of Estimates

The preparation of the accompanying unaudited Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments.  Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances.  Aon adjusts such estimates and assumptions when facts and circumstances dictate.  Illiquid credit markets, volatile equity markets, and foreign currency movements increase the uncertainty inherent in such estimates and assumptions.  As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates.  Changes in estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.

XML

Share-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based compensation expense recognized in continuing operations

The following table summarizes share-based compensation expense recognized in the Condensed Consolidated Statements of Income in Compensation and benefits (in millions):

	Three months ended March 31,
	2014		2013
Restricted share units (“RSUs”)	$	60	$	55
Performance share awards (“PSAs”)	39		11
Share options	—		1
Employee share purchase plans	3		2
Total share-based compensation expense	$	102	$	69

Restricted share unit activity

A summary of the status of the Company’s RSUs is as follows (shares in thousands):

	Three months ended March 31,
	2014				2013
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	9,759		$	51	10,432		$	44
Granted	1,146		83		1,764		60
Vested	(1,950	)	51		(2,080	)	46
Forfeited	(125	)	50		(128	)	44
Non-vested at end of period	8,830		56		9,988		47

 ______________________________________________

(1) Represents per share weighted average fair value of award at date of grant.

Performance-based plans

Information as of March 31, 2014 regarding the Company’s target PSAs granted and shares that would be issued at current performance levels for PSAs granted during the three months ended March 31, 2014 and the years ended December 31, 2013 and 2012, respectively, is as follows (shares in thousands, dollars in millions, except fair value):

	As of March 31, 2014		As of December 31, 2013		As of December 31, 2012
Target PSAs granted	816		1,135		1,369
Fair value (1)	$	81	$	58	$	47
Number of shares that would be issued based on current performance levels	816		2,243		2,682
Unamortized expense, based on current performance levels	$	65	$	82	$	34

 ______________________________________________

(1) Represents per share weighted average fair value of award at date of grant.

Share options and related information

A summary of the status of the Company’s share options and related information is as follows (shares in thousands):

	Three months ended March 31,
	2014				2013
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Beginning outstanding	3,462		$	32	5,611		$	32
Granted	—		—		—		—
Exercised	(416	)	33		(610	)	31
Forfeited and expired	(2	)	36		(10	)	33
Outstanding at end of period	3,044		32		4,991		32
Exercisable at end of period	2,928		32		4,579		32

Other information related to the company's share options

Other information related to the Company’s share options is as follows (in millions):

	Three months ended March 31,
	2014		2013
Aggregate intrinsic value of stock options exercised	$	21	$	17
Cash received from the exercise of stock options	14		20
Tax benefit realized from the exercise of stock options	6		3

XML

Other Financial Data Schedule of Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Financial Data [Abstract]
Prepaid expenses	$ 219	$ 229
Taxes receivable	130	111
Deferred project costs	102	98
Deferred tax assets	81	93
Other	45	32
Other Assets, Current	$ 577	$ 563

XML

Shareholders' Equity Schedule of Net Income from Participating Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]
Net income from participating securities	$ 3	$ 3

XML

Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue
Commissions, fees and other	$ 2,941	$ 2,908
Fiduciary investment income	6	7
Total revenue	2,947	2,915
Expenses
Compensation and benefits	1,751	1,725
Other general expenses	727	780
Total operating expenses	2,478	2,505
Operating income	469	410
Interest income	2	1
Interest expense	(58)	(52)
Intercompany interest income (expense)	0	0
Other income	1	9
Income before income taxes	414	368
Income tax (benefit) expense	78	96
Income (loss) before equity in earnings of subsidiaries	336	272
Equity in earnings of subsidiaries, net of tax	0	0
Net income	336	272
Less: Net income attributable to noncontrolling interests	11	11
Net income attributable to Aon shareholders	325	261
Aon plc [Member]
Revenue
Commissions, fees and other	1	1
Fiduciary investment income	0	0
Total revenue	1	1
Expenses
Compensation and benefits	12	11
Other general expenses	7	7
Total operating expenses	19	18
Operating income	(18)	(17)
Interest income	(2)	0
Interest expense	(9)	(2)
Intercompany interest income (expense)	111	(7)
Other income	0	0
Income before income taxes	82	(26)
Income tax (benefit) expense	20	(5)
Income (loss) before equity in earnings of subsidiaries	62	(21)
Equity in earnings of subsidiaries, net of tax	263	282
Net income	325	261
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to Aon shareholders	325	261
Aon Corporation [Member]
Revenue
Commissions, fees and other	0	0
Fiduciary investment income	0	0
Total revenue	0	0
Expenses
Compensation and benefits	8	15
Other general expenses	17	6
Total operating expenses	25	21
Operating income	(25)	(21)
Interest income	0	1
Interest expense	(31)	(34)
Intercompany interest income (expense)	(74)	43
Other income	0	(1)
Income before income taxes	(130)	(12)
Income tax (benefit) expense	(50)	(5)
Income (loss) before equity in earnings of subsidiaries	(80)	(7)
Equity in earnings of subsidiaries, net of tax	280	254
Net income	200	247
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to Aon shareholders	200	247
Other Non-Guarantor Subsidiaries [Member]
Revenue
Commissions, fees and other	2,940	2,907
Fiduciary investment income	6	7
Total revenue	2,946	2,914
Expenses
Compensation and benefits	1,731	1,699
Other general expenses	703	767
Total operating expenses	2,434	2,466
Operating income	512	448
Interest income	4	0
Interest expense	(18)	(16)
Intercompany interest income (expense)	(37)	(36)
Other income	1	10
Income before income taxes	462	406
Income tax (benefit) expense	108	106
Income (loss) before equity in earnings of subsidiaries	354	300
Equity in earnings of subsidiaries, net of tax	0	0
Net income	354	300
Less: Net income attributable to noncontrolling interests	11	11
Net income attributable to Aon shareholders	343	289
Consolidating Adjustments [Member]
Revenue
Commissions, fees and other	0	0
Fiduciary investment income	0	0
Total revenue	0	0
Expenses
Compensation and benefits	0	0
Other general expenses	0	0
Total operating expenses	0	0
Operating income	0	0
Interest income	0	0
Interest expense	0	0
Intercompany interest income (expense)	0	0
Other income	0	0
Income before income taxes	0	0
Income tax (benefit) expense	0	0
Income (loss) before equity in earnings of subsidiaries	0	0
Equity in earnings of subsidiaries, net of tax	(543)	(536)
Net income	(543)	(536)
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to Aon shareholders	$ (543)	$ (536)

XML

Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Revenue
Commissions, fees and other	$ 2,941		$ 2,908
Fiduciary investment income	6		7
Total revenue	2,947		2,915
Expenses
Compensation and benefits	1,751		1,725
Other general expenses	727		780
Total operating expenses	2,478		2,505
Operating income	469		410
Interest income	2		1
Interest expense	(58)		(52)
Other income	1		9
Income before income taxes	414		368
Income taxes	78		96
Net income	336		272
Less: Net income attributable to noncontrolling interests	11		11
Net income attributable to Aon shareholders	$ 325		$ 261
Basic net income per share attributable to Aon shareholders (in dollars per share)	$ 1.07		$ 0.82
Diluted net income per share attributable to Aon shareholders (in dollars per share)	$ 1.06		$ 0.82
Cash dividends per share paid on ordinary shares (in dollars per share)	$ 0.18		$ 0.16
Weighted average ordinary shares outstanding - basic	303.5	[1]	316.4	[1]
Weighted average ordinary shares outstanding - diluted	307.2		320.0

[1] Includes 3.4 million and 4.2 million of participating securities for the three months ended March 31, 2014 and 2013, respectively

XML

Acquisitions and Dispositions - Dispositions (Details) (Risk Solutions [Member], USD $)	3 Months Ended
	Mar. 31, 2014 business	Mar. 31, 2013 business
Risk Solutions [Member]
Dispositions
Number of dispositions	1	3
Gain (loss) recognized on sale	$ 1,000,000	$ 0

XML

Condensed Consolidated Statement of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Ordinary Shares and Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member]	Non-controlling Interests [Member]
Beginning Balance at Dec. 31, 2013	$ 8,195	$ 4,788	$ 5,731	$ (2,374)	$ 50
Beginning Balance (in shares) at Dec. 31, 2013	300.7	300.7
Increase (Decrease) in Shareholders' Equity
Net income	336		325		11
Shares issued - employee benefit plans (in shares)		0.3
Shares issued - employee benefit plans	14	14
Shares issued - employee compensation (in shares)		2.7
Shares issued - employee compensation	(85)	(85)
Shares purchased (in shares)		(7.2)
Shares purchased	(600)		(600)
Tax benefit - employee benefit plans	44	44
Share-based compensation expense	102	102
Dividends to shareholders	(53)		(53)
Net change in fair value of investments	1			1
Net change in fair value of derivatives	9			9
Net foreign currency translation adjustments	16			18	(2)
Net post-retirement benefit obligation	26			26
Purchase of subsidiary shares from non-controlling interests	1				1
Dividends paid to non-controlling interests on subsidiary common stock	0				0
Ending Balance at Mar. 31, 2014	$ 8,006	$ 4,863	$ 5,403	$ (2,320)	$ 60
Ending Balance (in shares) at Mar. 31, 2014	296.5	296.5

XML

Share-Based Compensation Plans Schedule of Performance-based plans (Details) (Performance Shares [Member], USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target PSAs granted	816		1,135		1,369
Fair value	$ 81	[1]	$ 58	[1]	$ 47	[1]
Number of shares that would be issued based on current performance levels	816		2,243		2,682
Unamortized expense, based on current performance levels	$ 65		$ 82		$ 34

[1] Represents per share weighted average fair value of award at date of grant.

XML

Segment Information (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Schedule of total revenue by business segments

Aon’s total revenue is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	1,994		$	1,971
HR Solutions	965			954
Intersegment eliminations	(12		)	(10		)
Total revenue	$	2,947		$	2,915

Schedule of commissions, fees and other revenues by products

Commissions, fees and other revenues by product are as follows (in millions):

	Three months ended March 31,
	2014			2013
Retail brokerage	$	1,579		$	1,562
Reinsurance brokerage	409			402
Total Risk Solutions Segment	1,988			1,964
Consulting services	384			382
Outsourcing	589			581
Intrasegment	(8		)	(9		)
Total HR Solutions Segment	965			954
Intersegment	(12		)	(10		)
Total commissions, fees and other revenue	$	2,941		$	2,908

Schedule of fiduciary investment income by business segments

Fiduciary investment income by segment is as follows (in millions):

	Three months ended March 31,
	2014		2013
Risk Solutions	$	6	$	7
HR Solutions	—		—
Total fiduciary investment income	$	6	$	7

Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	445		$	403
HR Solutions	67			51
Segment income before income taxes	512			454
Unallocated expenses	(43		)	(44		)
Interest income	2			1
Interest expense	(58		)	(52		)
Other income	1			9
Income before income taxes	$	414		$	368

XML

Derivatives and Hedging Notional and fair values of derivative instruments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Derivatives, Fair Value
Notional Amount	$ 1,572		$ 1,577
Derivative Assets	82	[1]	80	[1]
Derivative Liabilities	94	[2]	93	[2]
Gross Amounts Offset in the Statement of Financial Position	(24)		(30)
Net Amounts of Assets Presented in the Statement of Financial Position	58	[3]	50	[3]
Gross Amounts Offset in the Statement of Financial Position	(24)		(30)
Net Amounts of Liabilities Presented in the Statement of Financial Position	70	[4]	63	[4]
Other Current Assets [Member]
Derivatives, Fair Value
Derivative Assets	49		46
Net Amounts of Assets Presented in the Statement of Financial Position	21		18
Other Noncurrent Assets [Member]
Derivatives, Fair Value
Derivative Assets	33		34
Net Amounts of Assets Presented in the Statement of Financial Position	37		32
Other Current Liabilities [Member]
Derivatives, Fair Value
Derivative Liabilities	18		51
Net Amounts of Liabilities Presented in the Statement of Financial Position	18		23
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value
Derivative Liabilities	76		42
Net Amounts of Liabilities Presented in the Statement of Financial Position	52		40
Derivatives accounted for as hedges [Member]
Derivatives, Fair Value
Notional Amount	1,395		1,362
Derivative Assets	82	[1]	80	[1]
Derivative Liabilities	94	[2]	93	[2]
Gross Amounts Offset in the Statement of Financial Position	(24)		(30)
Net Amounts of Assets Presented in the Statement of Financial Position	58	[3]	50	[3]
Gross Amounts Offset in the Statement of Financial Position	(24)		(30)
Net Amounts of Liabilities Presented in the Statement of Financial Position	70	[4]	63	[4]
Derivatives accounted for as hedges [Member] | Interest rate contracts [Member]
Derivatives, Fair Value
Notional Amount	172		171
Derivative Assets	9	[1]	9	[1]
Derivative Liabilities	0	[2]	0	[2]
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Assets Presented in the Statement of Financial Position	9	[3]	9	[3]
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Liabilities Presented in the Statement of Financial Position	0	[4]	0	[4]
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member]
Derivatives, Fair Value
Notional Amount	1,223		1,191
Derivative Assets	73	[1]	71	[1]
Derivative Liabilities	94	[2]	93	[2]
Gross Amounts Offset in the Statement of Financial Position	(24)		(30)
Net Amounts of Assets Presented in the Statement of Financial Position	49	[3]	41	[3]
Gross Amounts Offset in the Statement of Financial Position	(24)		(30)
Net Amounts of Liabilities Presented in the Statement of Financial Position	70	[4]	63	[4]
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivatives, Fair Value
Notional Amount	177		215
Derivative Assets	0	[1]	0	[1]
Derivative Liabilities	0	[2]	0	[2]
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Assets Presented in the Statement of Financial Position	0	[3]	0	[3]
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Liabilities Presented in the Statement of Financial Position	$ 0	[4]	$ 0	[4]

[1] Included within Other current assets ($49 million and $46 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($33 million and $34 million at March 31, 2014 and December 31, 2013, respectively)

[2] Included within Other current liabilities ($18 million and $51 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($76 million and $42 million at March 31, 2014 and December 31, 2013, respectively)

[3] Included within Other current assets ($21 million and $18 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($37 million and $32 million at March 31, 2014 and December 31, 2013, respectively)

[4] Included within Other current liabilities ($18 million and $23 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($52 million and $40 million at March 31, 2014 and December 31, 2013, respectively)

XML

Fair Value Measurements and Financial Instruments

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements and Financial Instruments

Fair Value Measurements and Financial Instruments

Accounting standards establish a three tier fair value hierarchy that prioritizes the inputs used in measuring fair values as follows:

• Level 1 — observable inputs such as quoted prices for identical assets in active markets;

• Level 2 — inputs other than quoted prices for identical assets in active markets, that are observable either directly or indirectly; and

• Level 3 — unobservable inputs in which there is little or no market data which requires the use of valuation techniques and the development of assumptions.

The following methods and assumptions are used to estimate the fair values of the Company’s financial instruments:

Money market funds and highly liquid debt securities are carried at cost and amortized cost, respectively, as an approximation of fair value. Based on market convention, the Company considers cost a practical and expedient measure of fair value.

Cash, cash equivalents, and highly liquid debt instruments consist of cash and institutional short-term investment funds. The Company independently reviews the short-term investment funds to obtain reasonable assurance the fund net asset value is $1 per share.

Equity investments consist of domestic and international equity securities and exchange traded equity derivatives valued using the closing stock price on a national securities exchange. Over the counter equity derivatives are valued using observable inputs such as underlying prices of the equity security and volatility. The Company independently reviews the listing of Level 1 equity securities in the portfolio and agrees the closing stock prices to a national securities exchange, and on a sample basis, independently verifies the observable inputs for Level 2 equity derivatives and securities.

Fixed income investments consist of certain categories of bonds and derivatives. Corporate, government, and agency bonds are valued by pricing vendors who estimate fair value using recently executed transactions and proprietary models based on observable inputs, such as interest rate spreads, yield curves and credit risk. Asset-backed securities are valued by pricing vendors who estimate fair value using discounted cash flow models utilizing observable inputs based on trade and quote activity of securities with similar features. Fixed income derivatives are valued by pricing vendors using observable inputs such as interest rates and yield curves. The Company obtains a detailed understanding of the models, inputs, and assumptions used in developing prices provided by its vendors. This understanding includes discussions with valuation resources at the vendor. During these discussions, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the pricing vendor and independently verifies the observable inputs, as well as assesses assumptions used for reasonableness based on relevant market conditions and internal Company guidelines. If an assumption is deemed unreasonable, based on the Company’s guidelines, it is then reviewed by a member of management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates used in the Condensed Consolidated Financial Statements.

Pooled funds consist of various equity, fixed income, commodity, and real estate mutual fund type investment vehicles. Pooled investment funds fair value is estimated based on the proportionate share ownership in the underlying net assets of the investment, which is based on the fair value of the underlying securities that trade on a national securities exchange. Where possible, the Company independently reviews the listing securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the fund and discusses fund performance with pooled fund managers. The Company obtains audited fund manager financial statements, when available. If the pooled fund is designed to replicate a publicly traded index, the Company compares the performance of the fund to the index to assess the reasonableness of the fair value measurement.

Alternative investments consist of limited partnerships, private equity and hedge funds. Alternative investment fair value is generally estimated based on the proportionate share ownership in the underlying net assets of the investment as determined by the general partner or investment manager. The valuations are based on various factors depending on investment strategy, proprietary models, and specific financial data or projections. The Company obtains audited fund manager financial statements, when available. The Company obtains a detailed understanding of the models, inputs and assumptions used in developing prices provided by the investment managers (or appropriate party) through regular discussions. During these discussions with the investment managers, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the investment manager and independently verifies the observable inputs, as well as assesses assumptions used for reasonableness based on relevant market conditions and internal Company guidelines. If an assumption is deemed unreasonable, based on the Company’s guidelines, it is then reviewed by a member of management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates in the Condensed Consolidated Financial Statements.

Derivatives are carried at fair value, based upon industry standard valuation techniques that use, where possible, current market-based or independently sourced pricing inputs, such as interest rates, currency exchange rates, or implied volatilities.

Annuity contracts consist of insurance group annuity contracts purchased to match the pension benefit payment stream owed to certain selected plan participant demographics within a few major United Kingdom defined benefit plans. Annuity contracts are valued using a discounted cash flow model utilizing assumptions such as discount rate, mortality, and inflation. The Company independently verifies the observable inputs.

Real estate and REITs consist of publicly traded real estate investment trusts ("REITs") and direct real estate investments. Level 1 REITs are valued using the closing stock price on a national securities exchange. The Level 3 values are based on the proportionate share of ownership in the underlying net asset value as determined by the investment manager. The Company independently reviews the listing of Level 1 REIT securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the Level 3 real estate funds and discusses performance with the fund managers. The Company obtains audited fund manager financial statements, when available. See the description of “Alternative investments” for further detail on valuation procedures surrounding Level 3 REITs.

Guarantees are carried at fair value, which is based on discounted estimated cash flows using published historical cumulative default rates and discount rates commensurate with the underlying exposure.

Debt is carried at outstanding principal balance, less any unamortized discount or premium. Fair value is based on quoted market prices or estimates using discounted cash flow analyses based on current borrowing rates for similar types of borrowing arrangements.

The following tables present the categorization of the Company’s assets and liabilities that are measured at fair value on a recurring basis at March 31, 2014 and December 31, 2013 (in millions):

			Fair Value Measurements Using
	Balance at March 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds and highly liquid debt securities (1)	$	2,086	$	2,061	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	1		—		—		1
Government bonds	7		—		7		—
Equity securities	15		6		9		—
Derivatives:
Interest rate contracts	9		—		9		—
Foreign exchange contracts	73		—		73		—
Liabilities:
Derivatives:
Foreign exchange contracts	94		—		94		—

  ______________________________________________

(1) Includes $2,061 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

			Fair Value Measurements Using
	Balance at December 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds and highly liquid debt securities (1)	$	2,079	$	2,054	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	2		—		—		2
Government bonds	7		—		7		—
Equity securities	13		6		7		—
Derivatives:
Interest rate contracts	9		—		9		—
Foreign exchange contracts	71		—		71		—
Liabilities:
Derivatives:
Foreign exchange contracts	93		—		93		—

  ______________________________________________

(1)  Includes $2,054 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

There were no transfers of assets or liabilities between fair value hierarchy levels in the three months endedMarch 31, 2014 and 2013, respectively. There were no realized or unrealized gains or losses recognized in the Condensed Consolidated Statements of Income during either the three months ended March 31, 2014 or 2013, related to assets and liabilities measured at fair value using unobservable inputs.

The fair value of Long-term debt is classified as Level 2 of the fair value hierarchy. The following table discloses the Company’s financial instruments where the carrying amounts and fair values differ (in millions):

	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	3,669	$	3,966	$	3,686	$	3,894

XML

Guarantee of Registered Securities (Tables)

3 Months Ended

Mar. 31, 2014

Guarantee of Registered Securities [Abstract]

Condensed Consolidating Statements of Income

Condensed Consolidating Statement of Income

	Three months ended March 31, 2014
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,940		$	—		$	2,941
Fiduciary investment income	—			—			6			—			6
Total revenue	1			—			2,946			—			2,947
Expenses
Compensation and benefits	12			8			1,731			—			1,751
Other general expenses	7			17			703			—			727
Total operating expenses	19			25			2,434			—			2,478
Operating (loss) income	(18		)	(25		)	512			—			469
Interest income	(2		)	—			4			—			2
Interest expense	(9		)	(31		)	(18		)	—			(58		)
Intercompany interest income (expense)	111			(74		)	(37		)	—			—
Other income	—			—			1			—			1
Income (loss) before taxes	82			(130		)	462			—			414
Income tax (benefit) expense	20			(50		)	108			—			78
Income (loss) before equity in earnings of subsidiaries	62			(80		)	354			—			336
Equity in earnings of subsidiaries, net of tax	263			280			—			(543		)	—
Net income	325			200			354			(543		)	336
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	325		$	200		$	343		$	(543	)	$	325

Condensed Consolidating Statement of Income

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,907		$	—		$	2,908
Fiduciary investment income	—			—			7			—			7
Total revenue	1			—			2,914			—			2,915
Expenses
Compensation and benefits	11			15			1,699			—			1,725
Other general expenses	7			6			767			—			780
Total operating expenses	18			21			2,466			—			2,505
Operating (loss) income	(17		)	(21		)	448			—			410
Interest income	—			1			—			—			1
Interest expense	(2		)	(34		)	(16		)	—			(52		)
Intercompany interest (expense) income	(7		)	43			(36		)	—			—
Other (expense) income	—			(1		)	10			—			9
(Loss) income before taxes	(26		)	(12		)	406			—			368
Income tax (benefit) expense	(5		)	(5		)	106			—			96
(Loss) income before equity in earnings of subsidiaries	(21		)	(7		)	300			—			272
Equity in earnings of subsidiaries, net of tax	282			254			—			(536		)	—
Net income	261			247			300			(536		)	272
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	261		$	247		$	289		$	(536	)	$	261

Condensed Consolidating Statements of Comprehensive Income

Condensed Consolidating Statement of Comprehensive Income

	Three months ended March 31, 2014
						Other
	Aon		Aon			Non-Guarantor			Consolidating
(millions)	plc		Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	325	$	200		$	354		$	(543	)	$	336
Less: Net income attributable to noncontrolling interests	—		—			11			—			11
Net income attributable to Aon shareholders	$	325	$	200		$	343		$	(543	)	$	325
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—		—			1			—			1
Change in fair value of derivatives	—		1			8			—			9
Foreign currency translation adjustments	—		(17		)	33			—			16
Post-retirement benefit obligation	—		6			20			—			26
Total other comprehensive income	—		(10		)	62			—			52
Equity in other comprehensive loss of subsidiaries, net of tax	54		69			—			(123		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—			(2		)	—			(2		)
Total other comprehensive income attributable to Aon shareholders	54		59			64			(123		)	54
Comprehensive income attributable to Aon shareholders	$	379	$	259		$	407		$	(666	)	$	379

Condensed Consolidating Statement of Comprehensive Income

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	261		$	247		$	300		$	(536	)	$	272
Less: Net income attributable to noncontrolling interests	—			—			11			—			11
Net income attributable to Aon shareholders	$	261		$	247		$	289		$	(536	)	$	261
Other comprehensive income (loss), net of tax:
Change in fair value of investments	—			—			—			—			—
Change in fair value of derivatives	—			1			(15		)	—			(14		)
Foreign currency translation adjustments	—			(8		)	(166		)	—			(174		)
Post-retirement benefit obligation	—			7			16			—			23
Total other comprehensive income	—			—			(165		)	—			(165		)
Equity in other comprehensive income of subsidiaries, net of tax	(165		)	(164		)	—			329			—
Less: Other comprehensive income attributable to noncontrolling interests	—			—			—			—			—
Total other comprehensive income attributable to Aon shareholders	(165		)	(164		)	(165		)	329			(165		)
Comprehensive income attributable to Aon Shareholders	$	96		$	83		$	124		$	(207	)	$	96

Condensed Consolidating Statements of Financial Position

Condensed Consolidating Statement of Financial Position

	As of March 31, 2014
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	—	$	154	$	1,372	$	(1,188	)	$	338
Short-term investments	—		101		239		—			340
Receivables, net	—		1		2,879		—			2,880
Fiduciary assets	—		—		12,038		—			12,038
Intercompany receivables	116		3,982		5,878		(9,976		)	—
Other current assets	—		109		538		(70		)	577
Total Current Assets	116		4,347		22,944		(11,234		)	16,173
Goodwill	—		—		9,030		—			9,030
Intangible assets, net	—		—		2,500		—			2,500
Fixed assets, net	—		—		785		—			785
Investments	—		69		74		—			143
Intercompany receivables	7,166		2,163		2,201		(11,530		)	—
Other non-current assets	146		509		1,477		(686		)	1,446
Investment in subsidiary	4,979		12,165		—		(17,144		)	—
TOTAL ASSETS	$	12,407	$	19,253	$	39,011	$	(40,594	)	$	30,077
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	12,038	$	—		$	12,038
Short-term debt and current portion of long-term debt	227		140		710		—			1,077
Accounts payable and accrued liabilities	1,218		41		1,428		(1,188		)	1,499
Intercompany payables	87		5,834		4,055		(9,976		)	—
Other current liabilities	33		47		957		(70		)	967
Total Current Liabilities	1,565		6,062		19,188		(11,234		)	15,581
Long-term debt	792		2,516		361		—			3,669
Pension, other post-retirement and other post-employment liabilities	—		930		643		—			1,573
Intercompany payables	2,100		7,267		2,163		(11,530		)	—
Other non-current liabilities	4		112		1,818		(686		)	1,248
TOTAL LIABILITIES	4,461		16,887		24,173		(23,450		)	22,071
TOTAL AON SHAREHOLDERS’ EQUITY	7,946		2,366		14,778		(17,144		)	7,946
Noncontrolling interests	—		—		60		—			60
TOTAL EQUITY	7,946		2,366		14,838		(17,144		)	8,006
TOTAL LIABILITIES AND EQUITY	$	12,407	$	19,253	$	39,011	$	(40,594	)	$	30,077

Condensed Consolidating Statement of Financial Position

	As of December 31, 2013
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	—	$	247	$	1,246	$	(1,016	)	$	477
Short-term investments	—		163		360		—			523
Receivables, net	—		4		2,892		—			2,896
Fiduciary assets	—		—		11,871		—			11,871
Intercompany receivables	186		3,503		5,452		(9,141		)	—
Other current assets	—		69		513		(19		)	563
Total Current Assets	186		3,986		22,334		(10,176		)	16,330
Goodwill	—		—		8,997		—			8,997
Intangible assets, net	—		—		2,578		—			2,578
Fixed assets, net	—		—		791		—			791
Investments	—		57		75		—			132
Intercompany receivables	7,166		2,178		2,201		(11,545		)	—
Other non-current assets	146		560		1,421		(704		)	1,423
Investment in subsidiary	4,607		11,694		—		(16,301		)	—
TOTAL ASSETS	$	12,105	$	18,475	$	38,397	$	(38,726	)	$	30,251
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	11,871	$	—		$	11,871
Short-term debt and current portion of long-term debt	—		—		707		(4		)	703
Accounts payable and accrued liabilities	1,036		62		1,849		(1,016		)	1,931
Intercompany payables	15		5,449		3,677		(9,141		)	—
Other current liabilities	12		47		866		(19		)	906
Total Current Liabilities	1,063		5,558		18,970		(10,180		)	15,411
Long-term debt	792		2,512		378		4			3,686
Pension, other post-retirement and other post-employment liabilities	—		925		682		—			1,607
Intercompany payables	2,100		7,267		2,178		(11,545		)	—
Other non-current liabilities	5		159		1,892		(704		)	1,352
TOTAL LIABILITIES	3,960		16,421		24,100		(22,425		)	22,056
TOTAL AON SHAREHOLDERS’ EQUITY	8,145		2,054		14,247		(16,301		)	8,145
Noncontrolling interests	—		—		50		—			50
TOTAL EQUITY	8,145		2,054		14,297		(16,301		)	8,195
TOTAL LIABILITIES AND EQUITY	$	12,105	$	18,475	$	38,397	$	(38,726	)	$	30,251

Condensed Consolidating Statements of Cash Flows

Condensed Consolidating Statement of Cash Flows

	Three months ended March 31, 2014
	Aon			Aon			Other Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	89		$	(123	)	$	23		$	—		$	(11	)
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			37			5			—			42
Purchase of long-term investments	—			(10		)	—			—			(10		)
Net sales of short-term investments - non-fiduciary	—			62			121			—			183
Acquisition of businesses, net of cash acquired	—			—			(5		)	—			(5		)
Proceeds from sale of businesses	—			—			1			—			1
Capital expenditures	—			—			(55		)	—			(55		)
CASH PROVIDED BY INVESTING ACTIVITIES	—			89			67			—			156
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(600		)	—			—			—			(600		)
Advances from (to) affiliates	313			(206		)	65			(172		)	—
Issuance of shares for employee benefit plans	26			—			—			—			26
Issuance of debt	293			902			—			—			1,195
Repayment of debt	(68		)	(755		)	(6		)	—			(829		)
Cash dividends to shareholders	(53		)	—			—			—			(53		)
Purchase of shares from noncontrolling interests	—			—			1			—			1
Dividends paid to noncontrolling interests	—			—			—			—			—
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(89		)	(59		)	60			(172		)	(260		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			(24		)	—			(24		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	—			(93		)	126			(172		)	(139		)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	—			247			1,246			(1,016		)	477
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	—		$	154		$	1,372		$	(1,188	)	$	338

Condensed Consolidating Statement of Cash Flows

	Three months ended March 31, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	5		$	(23	)	$	72		$	—		$	54
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			1			17			—			18
Purchase of long-term investments	—			(3		)	—			—			(3		)
Net (purchases) sales of short-term investments - non-fiduciary	—			(39		)	23			—			(16		)
Acquisition of businesses, net of cash acquired	—			—			(2		)	—			(2		)
Proceeds from sale of businesses	—			—			1			—			1
Capital expenditures	—			—			(60		)	—			(60		)
CASH USED FOR INVESTING ACTIVITIES	—			(41		)	(21		)	—			(62		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(300		)	—			—			—			(300		)
Advances from (to) affiliates	96			(206		)	71			39			—
Issuance of shares for employee benefit plans	36			—			—			—			36
Issuance of debt	87			833			230			—			1,150
Repayment of debt	—			(511		)	(204		)	—			(715		)
Cash dividends to shareholders	(50		)	—			—			—			(50		)
Purchase of shares from noncontrolling interests	—			—			(1		)	—			(1		)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(131		)	116			96			39			120
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			5			—			5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(126		)	52			152			39			117
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	131			199			—			(39		)	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	5		$	251		$	152		$	—		$	408

XML

Segment Information

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company has two reportable segments:  Risk Solutions and HR Solutions.  Unallocated income and expenses, when combined with the operating segments and after the elimination of intersegment revenues and expenses, equal the amounts in the Condensed Consolidated Financial Statements.

Reportable operating segments have been determined using a management approach, which is consistent with the basis and manner in which Aon’s chief operating decision-maker (“CODM”) uses financial information for the purposes of allocating resources and evaluating performance.  The CODM assesses performance based on operating income and generally accounts for inter-segment revenue as if the revenue were from third parties and at what management believes are current market prices.  The Company does not present net assets by segment as this information is not reviewed by the CODM.

Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through Aon’s global distribution network.

HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies.

Aon’s total revenue is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	1,994		$	1,971
HR Solutions	965			954
Intersegment eliminations	(12		)	(10		)
Total revenue	$	2,947		$	2,915

Commissions, fees and other revenues by product are as follows (in millions):

	Three months ended March 31,
	2014			2013
Retail brokerage	$	1,579		$	1,562
Reinsurance brokerage	409			402
Total Risk Solutions Segment	1,988			1,964
Consulting services	384			382
Outsourcing	589			581
Intrasegment	(8		)	(9		)
Total HR Solutions Segment	965			954
Intersegment	(12		)	(10		)
Total commissions, fees and other revenue	$	2,941		$	2,908

Fiduciary investment income by segment is as follows (in millions):

	Three months ended March 31,
	2014		2013
Risk Solutions	$	6	$	7
HR Solutions	—		—
Total fiduciary investment income	$	6	$	7

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	445		$	403
HR Solutions	67			51
Segment income before income taxes	512			454
Unallocated expenses	(43		)	(44		)
Interest income	2			1
Interest expense	(58		)	(52		)
Other income	1			9
Income before income taxes	$	414		$	368

Unallocated expenses include administrative or other costs not attributable to the operating segments, such as corporate governance costs. Interest income represents income earned primarily on operating cash balances and certain income producing securities. Interest expense represents the cost of debt obligations.

Other income consists of equity earnings, realized gains or losses on the sale of investments, gains or losses on the disposal of businesses, gains or losses on derivatives, and gains or losses on foreign currency transactions.

XML

Fair Value Measurements and Financial Instruments Schedule of financial instruments where the carrying amounts and fair values differ (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair value of financial instrument
Carrying value of total debt	$ 3,669	$ 3,686
Fair value of total debt	$ 3,966	$ 3,894

XML

Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 336	$ 272
Adjustments to reconcile net income to cash provided by operating activities:
Gain from sales of businesses and investments, net	(5)	0
Depreciation of fixed assets	60	59
Amortization of intangible assets	86	99
Share-based compensation expense	102	69
Deferred income taxes	10	13
Change in assets and liabilities:
Fiduciary receivables	165	(42)
Short term investments - funds held on behalf of clients	(271)	(322)
Fiduciary liabilities	106	364
Receivables, net	13	174
Accounts payable and accrued liabilities	(468)	(417)
Restructuring reserves	(40)	(16)
Current income taxes	2	(65)
Pension, other post-retirement and other post-employment liabilities	(128)	(196)
Other assets and liabilities	21	62
CASH (USED FOR) PROVIDED BY OPERATING ACTIVITIES	(11)	54
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	42	18
Purchases of long-term investments	(10)	(3)
Net sales (purchases) of short-term investments - non-fiduciary	183	(16)
Acquisition of businesses, net of cash acquired	(5)	(2)
Proceeds from sale of businesses	1	1
Capital expenditures	(55)	(60)
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	156	(62)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(600)	(300)
Issuance of shares for employee benefit plans	26	36
Issuance of debt	1,195	1,150
Repayment of debt	(829)	(715)
Cash dividends to shareholders	(53)	(50)
Purchase of shares from noncontrolling interests	1	(1)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	(260)	120
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(24)	5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(139)	117
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	477	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	338	408
Supplemental disclosures:
Interest paid	64	32
Income taxes paid, net of refunds	$ 66	$ 148

XML

Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 336	$ 272
Less: Net income attributable to noncontrolling interests	11	11
Net income attributable to Aon shareholders	325	261
Other comprehensive income (loss), net of tax:
Change in fair value of investments	1	0
Change in fair value of derivatives	9	(14)
Foreign currency translation adjustments	16	(174)
Post-retirement benefit obligation	26	23
Total other comprehensive income (loss)	52	(165)
Less: Other comprehensive income attributable to noncontrolling interests	(2)	0
Total other comprehensive income (loss) attributable to Aon shareholders	54	(165)
Comprehensive income attributable to Aon shareholders	$ 379	$ 96

XML

Income Taxes

3 Months Ended

Mar. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective tax rate on net income was 18.9% and 26.1% for the quarters ended March 31, 2014 and 2013, respectively. The effective tax rate in the first quarter 2014 was favorably impacted by a change in the geographical distribution of income.

XML

Document and Entity Information	3 Months Ended
	Mar. 31, 2014
Document and Entity Information
Entity Registrant Name	Aon plc
Entity Central Index Key	0000315293
Document Type	10-Q
Document Period End Date	Mar. 31, 2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	296,483,350
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1

XML

Shareholders' Equity

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Shareholders' Equity

Shareholders’ Equity

Ordinary Shares

In April 2012, the Company’s Board of Directors authorized a share repurchase program under which up to $5.0 billion of Class A Ordinary Shares may be repurchased (“2012 Share Repurchase Program”). Under this program, shares may be repurchased through the open market or in privately negotiated transactions, from time to time, based on prevailing market conditions, and will be funded from available capital.

During the three months ended March 31, 2014, the Company repurchased 7.2 million shares at an average price per share of $83.45 for a total cost of $600 million under the 2012 Share Repurchase Program. During the three months ended March 31, 2013, the Company repurchased 5.0 million shares at an average price per share of $59.82 for a total cost of $300 million under the 2012 Share Repurchase Program. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is $2.3 billion. Since the inception of the 2012 Share Repurchase Program, the Company repurchased a total of 43.5 million shares for an aggregate cost of $2.7 billion.

Participating Securities

Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid, are participating securities, as defined, and therefore, should be included in computing basic and diluted earnings per share using the two class method.  Certain of the Company’s restricted share awards allow the holder to receive a non-forfeitable dividend equivalent.

Net income attributable to participating securities was $3 million in both the three months ended March 31, 2014 and 2013.

Weighted average shares outstanding are as follows (in millions):

	Three months ended March 31,
	2014	2013
Shares for basic earnings per share (1)	303.5	316.4
Common stock equivalents	3.7	3.6
Shares for diluted earnings per share	307.2	320.0

   ______________________________________________

(1) Includes 3.4 million and 4.2 million of participating securities for the three months ended March 31, 2014 and 2013, respectively.

Certain ordinary share equivalents were not included in the computation of diluted net income per share because their inclusion would have been antidilutive. There were no shares excluded from the calculation for the three months ended March 31, 2014. The number of shares excluded from the calculation was 0.2 million for the three months ended March 31, 2013.

Accumulated Other Comprehensive Loss

Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):

	Change in Fair Value of Investments (1)		Change in Fair Value of Derivatives (1)			Foreign Currency Translation Adjustments		Post-Retirement Benefit Obligation (2)			Total
Balance at December 31, 2013	$	1	$	(22	)	$	169	$	(2,522	)	$	(2,374	)
Other comprehensive income (loss) before reclassifications, net	1		—			18		—			19
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	—		14			—		36			50
Tax benefit	—		(5		)	—		(10		)	(15		)
Amounts reclassified from accumulated other comprehensive loss, net	—		9			—		26			35
Net current period other comprehensive (loss) income	1		9			18		26			54
Balance at March 31, 2014	$	2	$	(13	)	$	187	$	(2,496	)	$	(2,320	)

______________________________________________

(1) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income

(2) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits

XML

Condensed Consolidated Statements of Financial Position (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 338	$ 477
Short-term investments	340	523
Receivables, net	2,880	2,896
Fiduciary assets	12,038	11,871
Other current assets	577	563
Total Current Assets	16,173	16,330
Goodwill	9,030	8,997
Intangible assets, net	2,500	2,578
Fixed assets, net	785	791
Investments	143	132
Other non-current assets	1,446	1,423
TOTAL ASSETS	30,077	30,251
CURRENT LIABILITIES
Fiduciary liabilities	12,038	11,871
Short-term debt and current portion of long-term debt	1,077	703
Accounts payable and accrued liabilities	1,499	1,931
Other current liabilities	967	906
Total Current Liabilities	15,581	15,411
Long-term debt	3,669	3,686
Pension, other post-retirement and other post-employment liabilities	1,573	1,607
Other non-current liabilities	1,248	1,352
TOTAL LIABILITIES	22,071	22,056
EQUITY
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2014 - 296.5; 2013 - 300.7)	3	3
Additional paid-in capital	4,860	4,785
Retained earnings	5,403	5,731
Accumulated other comprehensive loss	(2,320)	(2,374)
TOTAL AON SHAREHOLDERS’ EQUITY	7,946	8,145
Noncontrolling interests	60	50
TOTAL EQUITY	8,006	8,195
TOTAL LIABILITIES AND EQUITY	$ 30,077	$ 30,251

XML

Acquisitions and Dispositions

3 Months Ended

Mar. 31, 2014

Business Combinations [Abstract]

Acquisitions and Dispositions

Acquisitions and Dispositions

Acquisitions

During the three months ended March 31, 2014, the Company completed the acquisition of one business in the Risk Solutions segment and one business in the HR Solutions segment.  During the three months ended March 31, 2013, the Company completed the acquisition of one business in the HR Solutions segment.

The following table includes the aggregate consideration transferred and the preliminary value of intangible assets recorded as a result of the Company’s acquisitions (in millions):

	Three months ended March 31,
	2014		2013
Consideration	$	5	$	2
Intangible assets:
Goodwill	$	4	$	2
Other intangible assets	4		1
Total	$	8	$	3

The results of operations of these acquisitions are included in the Condensed Consolidated Financial Statements as of the acquisition date.  The results of operations of the Company would not have been materially different if these acquisitions had been reported from the beginning of the period in which they were acquired.

Dispositions

During the three months ended March 31, 2014, the Company completed the disposition of one business in the Risk Solutions segment. Total pretax gain of $1 million was recognized on this sale, which is included in Other income in the Condensed Consolidated Statements of Income. During the three months ended March 31, 2013, the Company completed the disposition of three businesses in the Risk Solutions segment.  No gain or loss was recognized on these dispositions.

XML

Other Financial Data

3 Months Ended

Mar. 31, 2014

Other Financial Data [Abstract]

Other Financial Data

Other Financial Data

Condensed Consolidated Statements of Income Information

Other Income

Other income consists of the following (in millions):

	Three months ended March 31,
	2014			2013
Equity earnings	$	5		$	2
(Loss) gain on investments	(1		)	1
Foreign currency remeasurement gain	19			24
Derivative loss	(23		)	(18		)
Other	1			—
	$	1		$	9

Condensed Consolidated Statements of Financial Position Information

Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts is as follows (in millions):

	Three months ended March 31,
	2014			2013
Balance at beginning of period	$	90		$	118
Provision charged to operations	4			10
Accounts written off, net of recoveries	(5		)	(9		)
Effect of exchange rate changes and other	—			3
Balance at end of period	$	89		$	122

Other Current Assets

The components of Other current assets are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Prepaid expenses	$	219	$	229
Taxes receivable	130		111
Deferred project costs	102		98
Deferred tax assets	81		93
Other	45		32
	$	577	$	563

Other Non-Current Assets

The components of Other non-current assets are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Prepaid pension (1)	$	659	$	567
Deferred project costs	259		273
Deferred tax assets	180		193
Taxes receivable	100		108
Other	248		282
	$	1,446	$	1,423

  ______________________________________________

(1) Increase in prepaid pensions is primarily due to cash funding of the U.K. pension plans.

Other Current Liabilities

The components of Other current liabilities are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Deferred revenue	$	513	$	475
Taxes payable	140		136
Deferred tax liabilities	53		48
Other	261		247
	$	967	$	906

Other Non-Current Liabilities

The components of Other non-current liabilities are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Deferred tax liabilities	$	365	$	420
Leases	201		204
Taxes payable	194		184
Deferred revenue	128		134
Compensation and benefits	59		105
Other	301		305
	$	1,248	$	1,352

XML

Commitments and Contingencies

3 Months Ended

Mar. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal

Aon and its subsidiaries are subject to numerous claims, tax assessments, lawsuits and proceedings that arise in the ordinary course of business, which frequently include errors and omissions (“E&O”) claims. The damages claimed in these matters are or may be substantial, including, in many instances, claims for punitive, treble or extraordinary damages. Aon has historically purchased E&O insurance and other insurance to provide protection against certain losses that arise in such matters. Aon has exhausted or materially depleted its coverage under some of the policies that protect the Company and, consequently, is self-insured or materially self-insured for some historical claims. Accruals for these exposures and legal fees, and related insurance receivables, when applicable, have been provided to the extent that losses are deemed probable and are reasonably estimable. These amounts are adjusted from time to time as developments warrant. Amounts related to settlement provisions are recorded in Other general expenses in the Condensed Consolidated Statements of Income.

A retail insurance brokerage subsidiary of Aon provides insurance brokerage services to Northrop Grumman Corporation (“Northrop”). This Aon subsidiary placed Northrop’s excess property insurance program for the period covering 2005. Northrop suffered a substantial loss in August 2005 when Hurricane Katrina damaged Northrop’s facilities in the Gulf states. Northrop’s excess insurance carrier, Factory Mutual Insurance Company (“Factory Mutual”), denied coverage for the claim pursuant to a flood exclusion. Northrop sued Factory Mutual in the United States District Court for the Central District of California and later sought to add this Aon subsidiary as a defendant, asserting that if Northrop’s policy with Factory Mutual does not cover the losses suffered by Northrop stemming from Hurricane Katrina, then this Aon subsidiary will be responsible for Northrop’s losses. On August 26, 2010, the court granted in large part Factory Mutual’s motion for partial summary judgment regarding the applicability of the flood exclusion and denied Northrop’s motion to add this Aon subsidiary as a defendant in the federal lawsuit. On January 27, 2011, Northrop filed suit against this Aon subsidiary in state court in Los Angeles, California, pleading claims for negligence, breach of contract and negligent misrepresentation. Northrop has since settled with Factory Mutual. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Another retail insurance brokerage subsidiary of Aon has been sued in Tennessee state court by a client, Opry Mills Mall Limited Partnership (“Opry Mills”) that sustained flood damage to its property in May 2010. The lawsuit seeks $200 million from numerous insurers with whom this Aon subsidiary placed the client’s property insurance coverage. The insurers contend that only $50 million in coverage is available for the loss because the flood event occurred on property in a high hazard flood zone. Opry Mills is seeking full coverage from the insurers for the loss and has sued this Aon subsidiary in the alternative for the same $150 million difference on various theories of professional liability if the court determines there is not full coverage. In addition, Opry Mills seeks prejudgment interest, attorneys' fees and enhanced damages which could substantially increase Aon's exposure. Aon believes it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

A pensions consulting and administration subsidiary of Hewitt before its acquisition by Aon provided advisory services to the Trustees of the Philips UK pension fund and the relevant employer of fund beneficiaries (together, “Philips”). In January 2014, the Aon subsidiary was served with a High Court lawsuit alleging negligence and breach of duty. The proceedings assert Philips' right to claim damages related to Philips' use of a credit default swap hedging strategy pursuant to the supply of the advisory services, which is said to have resulted in substantial damages to Philips. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Mazeikiu Nafta ("MN"), which operates an oil refinery in Lithuania, has sued an insurance brokerage subsidiary of Aon in London. Aon placed property damage and business interruption coverage for MN. There was a fire at the refinery in 2006. MN settled with insurers in November 2011 and claimed against Aon in December 2012. The claim is for $125 million, which is the shortfall alleged by MN to have been caused by Aon's failure to obtain appropriate business interruption coverage. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

The International Road Transport Union ("IRU") sued Aon in a court in Switzerland. IRU alleges, among other things, that, between 1995 and 2004, a predecessor of Aon and, later, an Aon subsidiary (1) accepted commissions for certain insurance placements that violated a fee agreement entered between the parties and (2) negligently failed to ask certain insurance carriers to contribute to the IRU's risk management costs.  Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims.  The outcome of these proceedings, and the amount of any losses or other payments that may result, cannot be estimated at this time.

AXA Versicherung Aktiengesellschaft ("AXA") started arbitral proceedings against an insurance and reinsurance brokerage subsidiary of Aon in Germany.  Predecessors of AXA granted predecessors of the Aon subsidiary a mandate to underwrite non-proportional reinsurance business from 1975 through 1999. AXA alleges, among other things, that the Aon-related entities intentionally exceeded their mandate and that, if AXA had known of this intention, it would not have granted a mandate.  Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims.  The outcome of these proceedings, and the amount of any losses or other payments that may result, cannot be estimated at this time.

From time to time, Aon’s clients may bring claims and take legal action pertaining to the performance of fiduciary responsibilities. Whether client claims and legal action related to the Company’s performance of fiduciary responsibilities are founded or unfounded, if such claims and legal actions are resolved in a manner unfavorable to the Company, they may adversely affect Aon’s financial results and materially impair the market perception of the Company and that of its products and services.

Although the ultimate outcome of all matters referred to above cannot be ascertained, and liabilities in indeterminate amounts may be imposed on Aon or its subsidiaries, on the basis of present information, amounts already provided, availability of insurance coverages and legal advice received, it is the opinion of management that the disposition or ultimate determination of such claims will not have a material adverse effect on the consolidated financial position of Aon. However, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by an unfavorable resolution of these matters.

Guarantees and Indemnifications

In connection with the redomicile of Aon's headquarters ("the Redomestication"), the Company on April 2, 2012 entered various agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under issued and outstanding debt securities. Those agreements included the (1) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc, and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”) (amending and restating the Indenture, dated as of September 10, 2010, between Aon Corporation and the Trustee), (2) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of December 16, 2002, between Aon Corporation and the Trustee), (3) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of January 13, 1997, as supplemented by the First Supplemental Indenture, dated as of January 13, 1997) (4) First Supplemental Indenture, dated as of April 2, 2012, among Aon Finance N.S. 1, ULC, as issuer, Aon Corporation, as guarantor, Aon plc, as guarantor, and Computershare Trust Company of Canada, as trustee, and (5) Amended and Restated Trust Deed, among Aon Corporation, Aon plc, Aon Services Luxembourg & Co S.C.A. (formerly known as Aon Financial Services Luxembourg S.A.) (“Aon Luxembourg”) and BNY Mellon Corporate Trustee Services Limited, as trustee (the “Luxembourg Trustee”) (amending and restating the Trust Deed, dated as of July 1, 2009, as amended and restated on January 12, 2011, among Aon Delaware, Aon Luxembourg and the Luxembourg Trustee).

Effective as of the same date, the Company also entered into agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under the (1) $450,000,000 Term Credit Agreement dated June 15, 2011, among Aon Corporation, as borrower, Bank of America, N.A., as administrative agent and the other agents and lenders party thereto, (2) $400,000,000Five-Year Agreement dated March 20, 2012, among Aon Corporation, as borrower, Citibank, N.A., as administrative agent and the other agents and lenders party thereto and (3) €650,000,000 Facility Agreement, dated October 15, 2010, among Aon Corporation, the subsidiaries of Aon Corporation party thereto as borrowers, Citibank International plc, as agent, and the other agents and lenders party thereto, as amended on July 18, 2011.

The Company provides a variety of guarantees and indemnifications to its customers and others. The maximum potential amount of future payments represents the notional amounts that could become payable under the guarantees and indemnifications if there were a total default by the guaranteed parties, without consideration of possible recoveries under recourse provisions or other methods. These amounts may bear no relationship to the expected future payments, if any, for these guarantees and indemnifications. Any anticipated amounts payable are included in the Company’s Condensed Consolidated Financial Statements, and are recorded at fair value.

The Company expects that, as prudent business interests dictate, additional guarantees and indemnifications may be issued from time to time.

Letters of Credit

The Company had total letters of credit (“LOCs”) outstanding for approximately $66 million at March 31, 2014, compared to $71 million at December 31, 2013. These letters of credit cover the beneficiaries related to certain of Aon’s U.S. and Canadian non-qualified pension plan schemes and secure deductible retentions for Aon’s own workers compensation program. The Company has also issued LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at its international subsidiaries. Amounts are accrued in the Condensed Consolidated Financial Statements, and are recorded at fair value.

Commitments

The Company has provided commitments to fund certain limited partnerships in which it has an interest in the event that the general partners request funding. Some of these commitments have specific expiration dates and the maximum potential funding under these commitments was $24 million at March 31, 2014 compared to $34 million at December 31, 2013. During the three months endedMarch 31, 2014, the Company funded $10 million of these commitments.

Premium Payments

The Company has certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies. Costs associated with these guarantees, to the extent estimable and probable, are provided in Aon’s allowance for doubtful accounts. The maximum exposure with respect to such contractual contingent guarantees was approximately $64 million at March 31, 2014 compared to $98 million at December 31, 2013.

XML

Employee Benefits

3 Months Ended

Mar. 31, 2014

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

Employee Benefits

The following table provides the components of the net periodic benefit cost for Aon’s material U.K., U.S., and other significant international pension plans, which are located in the Netherlands and Canada (in millions):

	Three months ended March 31,
	U.K.						U.S.						Other
	2014			2013			2014			2013			2014			2013
Service cost	$	—		$	—		$	—		$	—		$	—		$	5
Interest cost	58			53			32			28			12			11
Expected return on plan assets	(82		)	(75		)	(39		)	(34		)	(15		)	(15		)
Amortization of net actuarial loss	13			12			10			13			2			6
Net periodic (benefit) cost	(11		)	(10		)	3			7			(1		)	7
Curtailment loss (gain) and other	—			—			1			—			(3		)	—
Total net periodic benefit cost	$	(11	)	$	(10	)	$	4		$	7		$	(4	)	$	7

Based on current assumptions, in 2014, Aon plans to contribute $185 million, $173 million, and $27 million to its U.K., U.S., and other significant international pension plans, respectively. During the three months ended March 31, 2014, contributions of $65 million, $40 million, and $12 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.

XML

Investments

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

The Company earns income on cash balances and investments, as well as on premium trust balances that the Company maintains for premiums collected from insureds but not yet remitted to insurance companies, and funds held under the terms of certain outsourcing agreements to pay certain obligations on behalf of clients.  Premium trust balances and receivables, as well as a corresponding liability, are included in Fiduciary assets and Fiduciary liabilities in the accompanying Condensed Consolidated Statements of Financial Position.

The Company’s interest-bearing assets and other investments are included in the following categories in the Condensed Consolidated Statements of Financial Position (in millions):

	March 31, 2014		December 31, 2013
Cash and cash equivalents	$	338	$	477
Short-term investments	340		523
Fiduciary assets (1)	4,088		3,778
Investments	143		132
	$	4,909	$	4,910

  ______________________________________________

(1) Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

The Company’s investments are as follows (in millions):

	March 31, 2014		December 31, 2013
Equity method investments	$	127	$	113
Other investments	8		10
Fixed-maturity securities	8		9
	$	143	$	132

XML

Share-Based Compensation Plans Share options activity (Details) (Share options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share options [Member]
Share Options (in shares)
Beginning outstanding	3,462	5,611
Granted	0	0
Exercised	(416)	(610)
Forfeited and expired	(2)	(10)
Outstanding at end of period	3,044	4,991
Exercisable at end of period	2,928	4,579
Weighted-Average Exercise Price (in dollars per share)
Beginning outstanding	$ 32	$ 32
Granted	$ 0	$ 0
Exercised	$ 33	$ 31
Forfeited and expired	$ 36	$ 33
Outstanding at end of period	$ 32	$ 32
Exercisable at end of period	$ 32	$ 32

XML

Goodwill and Other Intangible Assets

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

The changes in the net carrying amount of goodwill by reportable segment for the three months ended March 31, 2014 is as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of December 31, 2013	$	6,020		$	2,977		$	8,997
Goodwill related to current year acquisitions	2			2			4
Goodwill related to prior year acquisitions	(1		)	—			(1		)
Foreign currency translation	31			(1		)	30
Balance as of March 31, 2014	$	6,052		$	2,978		$	9,030

Other intangible assets by asset class are as follows (in millions):

	March 31, 2014						December 31, 2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets with indefinite lives:
Tradenames	$	1,019	$	—	$	1,019	$	1,019	$	—	$	1,019
Intangible assets with finite lives:
Customer related and contract based	2,729		1,386		1,343		2,720		1,310		1,410
Marketing, technology and other	587		449		138		584		435		149
	$	4,335	$	1,835	$	2,500	$	4,323	$	1,745	$	2,578

Amortization expense from finite lived intangible assets was $86 million and $99 million for the three months endedMarch 31, 2014 and 2013, respectively.

The estimated future amortization for finite lived intangible assets as of March 31, 2014 is as follows (in millions):

	Risk Solutions		HR Solutions		Total
Remainder of 2014	$	77	$	183	$	260
2015	83		212		295
2016	70		177		247
2017	59		141		200
2018	47		93		140
Thereafter	89		250		339
	$	425	$	1,056	$	1,481

XML

Restructuring

3 Months Ended

Mar. 31, 2014

Restructuring and Related Activities [Abstract]

Restructuring

Restructuring

Aon Hewitt Restructuring Plan

On October 14, 2010, the Company announced a global restructuring plan ("Aon Hewitt Plan") in connection with the acquisition of Hewitt. The Aon Hewitt Plan was intended to streamline operations across the combined Aon Hewitt organization. The Company incurred all remaining costs for the Aon Hewitt Plan and the plan was closed in the fourth quarter of 2013. For the three months endedMarch 31, 2014 no charges were taken under the Aon Hewitt Plan. For the three months endedMarch 31, 2013, $26 million of restructuring expenses were charged, of which $15 million and $11 million were in the HR Solutions segment and Risk Solutions segment, respectively.

As of December 31, 2013, the remaining liabilities for the Company's restructuring plans were $166 million. During the three months endedMarch 31, 2014, the Company made cash payments of $40 million, partially offset by foreign exchange translation of $1 million, resulting in restructuring liabilities of $127 million as of March 31, 2014.

XML

Debt

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Debt

Debt

The Company uses proceeds from the commercial paper market from time to time in order to meet short-term working capital needs and to retire other debt obligations.  At March 31, 2014, the Company had $374 million in commercial paper outstanding compared to no commercial paper outstanding at December 31, 2013. The weighted average commercial paper outstanding for the three months endedMarch 31, 2014 was $204 million. The weighted average interest rate of the commercial paper outstanding for the three months endedMarch 31, 2014 was 0.32%.

XML

Derivatives and Hedging Interest Rate Management Risk Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months	$ 15
Amount of (Loss) Recognized in Income on Derivative	23	18
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of (Loss) Recognized in Income on Derivative	$ 5	$ 9
Cash Flow Hedging [Member]
Derivative [Line Items]
Interest rate fluctuations, maximum hedging period	2 years

XML

Derivatives and Hedging Derivatives gains (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ (23)		$ (18)
Derivatives accounted for as hedges [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	(8)		(29)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	(21)		(11)
Derivatives accounted for as hedges [Member] | Cash Flow Hedging [Member] | Compensation and Benefits [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	11		4
Derivatives accounted for as hedges [Member] | Cash Flow Hedging [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	(19)		(33)
Derivatives accounted for as hedges [Member] | Interest rate contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	0	[1]	0	[1]
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	0	[2]	0	[2]
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	(8)	[3]	(29)	[3]
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	(21)	[4]	(11)	[4]
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Compensation and Benefits [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	3		1
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Other General Expenses [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):			1
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	18		9
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Net Investment Hedges [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	0		0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	0		0
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Fair value hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	0	[5],[6]	(1)	[5],[6]
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	$ 0	[6]	$ 1	[6]

[1] Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Interest Expense

[2] Included within Interest Expense

[3] Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Compensation and benefits ($11 million and $4 million gain for the three months ended March 31, 2014 and 2013, respectively), and Other income ($19 million and $33 million loss for the three months ended March 31, 2014 and 2013, respectively)

[4] Included within Compensation and benefits ($3 million and $1 million loss for the three months ended March 31, 2014 and 2013, respectively), Other general expenses ($1 million loss for the three months ended March 31, 2013), and Other income ($18 million and $9 million loss for the three months ended March 31, 2014 and 2013, respectively)

[5] Included in Interest expense

[6] Relates to fixed rate debt

XML

Derivatives and Hedging Foreign Exchange Risk Management Narrative (Details)	3 Months Ended
	Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Foreign currency exposures, maximum hedging period	1 year
Cash Flow Hedging [Member]
Derivative [Line Items]
Foreign currency exposures, maximum average hedging period	2 years
Foreign currency exposures, maximum hedging period	5 years
Net Investment Hedging [Member]
Derivative [Line Items]
Foreign currency exposures, maximum hedging period	2 years

XML

Fair Value Measurements and Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities that are measured at fair value on a recurring basis

The following tables present the categorization of the Company’s assets and liabilities that are measured at fair value on a recurring basis at March 31, 2014 and December 31, 2013 (in millions):

			Fair Value Measurements Using
	Balance at March 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds and highly liquid debt securities (1)	$	2,086	$	2,061	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	1		—		—		1
Government bonds	7		—		7		—
Equity securities	15		6		9		—
Derivatives:
Interest rate contracts	9		—		9		—
Foreign exchange contracts	73		—		73		—
Liabilities:
Derivatives:
Foreign exchange contracts	94		—		94		—

  ______________________________________________

(1) Includes $2,061 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

			Fair Value Measurements Using
	Balance at December 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds and highly liquid debt securities (1)	$	2,079	$	2,054	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	2		—		—		2
Government bonds	7		—		7		—
Equity securities	13		6		7		—
Derivatives:
Interest rate contracts	9		—		9		—
Foreign exchange contracts	71		—		71		—
Liabilities:
Derivatives:
Foreign exchange contracts	93		—		93		—

  ______________________________________________

(1)  Includes $2,054 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

Schedule of financial instruments where the carrying amounts and fair values differ

The fair value of Long-term debt is classified as Level 2 of the fair value hierarchy. The following table discloses the Company’s financial instruments where the carrying amounts and fair values differ (in millions):

	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	3,669	$	3,966	$	3,686	$	3,894

XML

Income Taxes Income Taxes (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate	18.90%	26.10%

XML

Derivatives and Hedging

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging

Derivatives and Hedging

The Company is exposed to market risks, including changes in foreign currency exchange rates and interest rates.  To manage the risk related to these exposures, the Company enters into various derivative instruments that reduce these risks by creating offsetting exposures.  The Company does not enter into derivative transactions for trading or speculative purposes.

Foreign Exchange Risk Management

The Company is exposed to foreign exchange risk when it receives revenues, pays expenses, or enters into intercompany loans denominated in a currency that differs from its functional currency, or other transactions that are denominated in a currency other than its functional currency.  The Company uses foreign exchange derivatives, typically forward contracts, options and cross currency swaps, to reduce its overall exposure to the effects of currency fluctuations on cash flows.  These exposures are hedged, on average, for less than two years; however, in limited instances, the Company has hedged certain exposures up to five years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to hedge its net investments in foreign operations for up to two years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to manage the currency exposure of the Company’s global liquidity profile, including monetary assets or liabilities that are denominated in a non-functional currency of an entity, for up to one year in the future. These derivatives are not accounted for as hedges, and changes in fair value are recorded each period in Other income in the Condensed Consolidated Statements of Income.

Interest Rate Risk Management

The Company holds variable-rate short-term brokerage and other operating deposits. The Company uses interest rate derivatives, typically swaps, to reduce its exposure to the effects of interest rate fluctuations on the forecasted interest receipts from these deposits for up to two years in the future.

Certain derivatives also give rise to credit risks from the possible non-performance by counterparties.  The credit risk at the balance sheet date is generally limited to the fair value of those contracts that are favorable to the Company.  The Company has reduced its credit risk by using International Swaps and Derivatives Association (“ISDA”) master agreements, collateral and credit support arrangements, entering into non-exchange-traded derivatives with highly-rated major financial institutions and by using exchange-traded instruments.  The Company monitors the creditworthiness of, and exposure to, its counterparties.  As of March 31, 2014, all net derivative positions were free of credit risk contingent features.  The Company has not received or pledged any collateral related to derivative arrangements as of March 31, 2014.

The notional and fair values of derivative instruments are as follows (in millions):

	Notional Amount				Derivative Assets (1)				Derivative Liabilities (2)
	March 31, 2014		December 31, 2013		March 31, 2014		December 31, 2013		March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	172	$	171	$	9	$	9	$	—	$	—
Foreign exchange contracts	1,223		1,191		73		71		94		93
Total	1,395		1,362		82		80		94		93
Derivatives not accounted for as hedges:
Foreign exchange contracts	177		215		—		—		—		—
Total	$	1,572	$	1,577	$	82	$	80	$	94	$	93

______________________________________________

(1) Included within Other current assets ($49 million and $46 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($33 million and $34 million at March 31, 2014 and December 31, 2013, respectively)

(2) Included within Other current liabilities ($18 million and $51 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($76 million and $42 million at March 31, 2014 and December 31, 2013, respectively)

Offsetting of financial assets and derivatives assets are as follows (in millions):

	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Assets Presented in the Statement of Financial Position (1)
	March 31, 2014		December 31, 2013		March 31, 2014			December 31, 2013			March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	9	$	9	$	—		$	—		$	9	$	9
Foreign exchange contracts	73		71		(24		)	(30		)	49		41
Total	82		80		(24		)	(30		)	58		50
Derivatives not accounted for as hedges:
Foreign exchange contracts	—		—		—			—			—		—
Total	$	82	$	80	$	(24	)	$	(30	)	$	58	$	50

______________________________________________

(1) Included within Other current assets ($21 million and $18 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current assets ($37 million and $32 million at March 31, 2014 and December 31, 2013, respectively)

Offsetting of financial liabilities and derivative liabilities are as follows (in millions):

	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Liabilities Presented in the Statement of Financial Position (2)
	March 31, 2014		December 31, 2013		March 31, 2014			December 31, 2013			March 31, 2014		December 31, 2013
Derivatives accounted for as hedges:
Interest rate contracts	$	—	$	—	$	—		$	—		$	—	$	—
Foreign exchange contracts	94		93		(24		)	(30		)	70		63
Total	94		93		(24		)	(30		)	70		63
Derivatives not accounted for as hedges:
Foreign exchange contracts	—		—		—			—			—		—
Total	$	94	$	93	$	(24	)	$	(30	)	$	70	$	63

______________________________________________

(2) Included within Other current liabilities ($18 million and $23 million at March 31, 2014 and December 31, 2013, respectively) or Other non-current liabilities ($52 million and $40 million at March 31, 2014 and December 31, 2013, respectively)

The amounts of derivative gains (losses) recognized in the Condensed Consolidated Financial Statements for the three months endedMarch 31, 2014 and 2013 are as follows (in millions):

	Three months ended March 31,
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	2014			2013
Cash flow hedges:
Interest rate contracts (1)	$	—		$	—
Foreign exchange contracts (2)	(8		)	(29		)
Total	$	(8	)	$	(29	)
Foreign net investment hedges:
Foreign exchange contracts	$	—		$	—

 ______________________________________________

(1) Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Interest Expense

(2) Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Compensation and benefits ($11 million and $4 million gain for the three months ended March 31, 2014 and 2013, respectively), and Other income ($19 million and $33 million loss for the three months ended March 31, 2014 and 2013, respectively)

Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	Three months ended March 31,
	2014			2013
Cash flow hedges:
Interest rate contracts (1)	$	—		$	—
Foreign exchange contracts (2)	(21		)	(11		)
Total	(21		)	(11		)
Foreign net investment hedges:
Foreign exchange contracts	$	—		$	—

 ______________________________________________

(1) Included within Interest Expense

(2) Included within Compensation and benefits ($3 million and $1 million loss for the three months ended March 31, 2014 and 2013, respectively), Other general expenses ($1 million loss for the three months ended March 31, 2013), and Other income ($18 million and $9 million loss for the three months ended March 31, 2014 and 2013, respectively)

The amount of gain (loss) recognized in the Condensed Consolidated Financial Statements is as follows (in millions):

	Three months ended March 31,
	Amount of Gain (Loss) Recognized in Income on Derivative (2)					Amount of Gain (Loss) Recognized in Income on Related Hedged Item
	2014		2013			2014		2013
Fair value hedges:
Foreign exchange contracts (1)	$	—	$	(1	)	$	—	$	1

  ______________________________________________

(1) Relates to fixed rate debt

(2) Included in Interest expense

The Company estimates that approximately $15 million of pretax losses currently included within Accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

The amount of gain (loss) recognized in income on the ineffective portion of derivatives for the three months endedMarch 31, 2014 and 2013 was not material.

During the three months endedMarch 31, 2014 and 2013, the Company recorded a loss of $5 million and $9 million, respectively, in Other income for foreign exchange derivatives not designated or qualifying as hedges.

XML

Other Financial Data (Tables)

3 Months Ended

Mar. 31, 2014

Other Financial Data [Abstract]

Schedule of Other Income

Other income consists of the following (in millions):

	Three months ended March 31,
	2014			2013
Equity earnings	$	5		$	2
(Loss) gain on investments	(1		)	1
Foreign currency remeasurement gain	19			24
Derivative loss	(23		)	(18		)
Other	1			—
	$	1		$	9

Schedule of Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts is as follows (in millions):

	Three months ended March 31,
	2014			2013
Balance at beginning of period	$	90		$	118
Provision charged to operations	4			10
Accounts written off, net of recoveries	(5		)	(9		)
Effect of exchange rate changes and other	—			3
Balance at end of period	$	89		$	122

Schedule of Other Current Assets

The components of Other current assets are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Prepaid expenses	$	219	$	229
Taxes receivable	130		111
Deferred project costs	102		98
Deferred tax assets	81		93
Other	45		32
	$	577	$	563

Schedule of Other Non-current Assets

The components of Other non-current assets are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Prepaid pension (1)	$	659	$	567
Deferred project costs	259		273
Deferred tax assets	180		193
Taxes receivable	100		108
Other	248		282
	$	1,446	$	1,423

  ______________________________________________

(1) Increase in prepaid pensions is primarily due to cash funding of the U.K. pension plans.

Schedule of Other Current Liabilities

The components of Other current liabilities are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Deferred revenue	$	513	$	475
Taxes payable	140		136
Deferred tax liabilities	53		48
Other	261		247
	$	967	$	906

Schedule of Other Non-current Liabilities

The components of Other non-current liabilities are as follows (in millions):

	Mar 31, 2014		Dec 31, 2013
Deferred tax liabilities	$	365	$	420
Leases	201		204
Taxes payable	194		184
Deferred revenue	128		134
Compensation and benefits	59		105
Other	301		305
	$	1,248	$	1,352

XML

Investments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Interest-bearing Assets
Cash and cash equivalents	$ 338		$ 477		$ 408	$ 291
Short-term investments	340		523
Fiduciary assets	4,088	[1]	3,778	[1]
Investments	143		132
Total interest-bearing assets	4,909		4,910
Investments:
Equity method investments	127		113
Other investments	8		10
Fixed-maturity securities	8		9
Investments	$ 143		$ 132

[1] Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

XML

Other Financial Data Schedule of Non-current Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Other Financial Data [Abstract]
Prepaid pension	$ 659	[1]	$ 567	[1]
Deferred project costs	259		273
Deferred tax assets	180		193
Taxes receivable	100		108
Other	248		282
Other Assets, Noncurrent	$ 1,446		$ 1,423

[1] Increase in prepaid pensions is primarily due to cash funding of the U.K. pension plans.

XML

Condensed Consolidated Statements of Financial Position (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Common stock, nominal or par value	$ 0.01	$ 0.01
Common stock, Authorized shares	750	750
Common stock, issued shares	296.5	300.7

XML

Cash and Cash Equivalents and Short-term Investments

3 Months Ended

Mar. 31, 2014

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Cash and Cash Equivalents and Short-term Investments

Cash and Cash Equivalents and Short-term Investments

Cash and cash equivalents include cash balances and all highly liquid investments with initial maturities of three months or less.  Short-term investments include certificates of deposit, money market funds and highly liquid debt instruments purchased with initial maturities in excess of three months but less than one year and are carried at amortized cost, which approximates fair value.

The Company is required to hold £77 million of operating funds in the U.K. by the Financial Conduct Authority, a U.K. based regulator, which were included in Short-term investments.  These operating funds, when translated to U.S. dollars, were equal to $128 million and $126 million at March 31, 2014 and December 31, 2013, respectively.  Cash and cash equivalents included restricted balances of $125 million and $88 million at March 31, 2014 and December 31, 2013, respectively. The restricted balances primarily relate to cash required to be held as collateral.

XML

Share-Based Compensation Plans Performance Share Awards Narrative (Details) (Performance Shares [Member])	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting conditions period	3 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, percent	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, percent	200.00%

XML

Commitments and Contingencies (Details)			1 Months Ended		3 Months Ended			0 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	May 31, 2010 Opry Mills Mall Limited Partnership [Member] USD ($)	Dec. 31, 2012 Mazeikiu Nafta [Member] USD ($)	Mar. 31, 2014 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($)	Dec. 31, 2013 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($)	Jun. 15, 2011 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Term Credit Agreement [Member] USD ($)	Mar. 20, 2012 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Five-Year Agreement [Member] USD ($)	Oct. 14, 2010 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Euro Facility Agreement [Member] EUR (€)
Legal, Guarantees and Indemnifications
Damages sought			$ 200,000,000	$ 125,000,000
Amount of coverage for damages contended by the insurers			50,000,000
Difference amount of damages sought by the client			150,000,000
Maximum potential funding under commitments	64,000,000	98,000,000			24,000,000	34,000,000	450,000,000	400,000,000	650,000,000
Term of credit agreement								5 years
Letters of credit outstanding	66,000,000	71,000,000
Commitments funded					$ 10,000,000

XML

Acquisitions and Dispositions (Tables)

3 Months Ended

Mar. 31, 2014

Business Combinations [Abstract]

Consideration transferred and preliminary value of intangible assets

The following table includes the aggregate consideration transferred and the preliminary value of intangible assets recorded as a result of the Company’s acquisitions (in millions):

	Three months ended March 31,
	2014		2013
Consideration	$	5	$	2
Intangible assets:
Goodwill	$	4	$	2
Other intangible assets	4		1
Total	$	8	$	3

XML

Guarantee of Registered Securities - Condensed Consolidating Statement of Financial Position (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS :
Cash and cash equivalents	$ 338	$ 477	$ 408	$ 291
Short-term investments	340	523
Receivables, net	2,880	2,896
Fiduciary assets	12,038	11,871
Intercompany receivables	0	0
Other current assets	577	563
Total Current Assets	16,173	16,330
Goodwill	9,030	8,997
Intangible assets, net	2,500	2,578
Fixed assets, net	785	791
Investments	143	132
Intercompany receivables	0	0
Other non-current assets	1,446	1,423
Investment in subsidiary	0	0
TOTAL ASSETS	30,077	30,251
CURRENT LIABILITIES
Fiduciary liabilities	12,038	11,871
Short-term debt and current portion of long-term debt	1,077	703
Accounts payable and accrued liabilities	1,499	1,931
Intercompany payables	0	0
Other current liabilities	967	906
Total Current Liabilities	15,581	15,411
Long-term debt	3,669	3,686
Pension, other post-retirement and other post-employment liabilities	1,573	1,607
Intercompany payables	0	0
Other non-current liabilities	1,248	1,352
TOTAL LIABILITIES	22,071	22,056
TOTAL AON SHAREHOLDERS’ EQUITY	7,946	8,145
Noncontrolling interests	60	50
TOTAL EQUITY	8,006	8,195
TOTAL LIABILITIES AND EQUITY	30,077	30,251
Aon plc [Member]
CURRENT ASSETS :
Cash and cash equivalents	0	0	5	131
Short-term investments	0	0
Receivables, net	0	0
Fiduciary assets	0	0
Intercompany receivables	116	186
Other current assets	0	0
Total Current Assets	116	186
Goodwill	0	0
Intangible assets, net	0	0
Fixed assets, net	0	0
Investments	0	0
Intercompany receivables	7,166	7,166
Other non-current assets	146	146
Investment in subsidiary	4,979	4,607
TOTAL ASSETS	12,407	12,105
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Short-term debt and current portion of long-term debt	227	0
Accounts payable and accrued liabilities	1,218	1,036
Intercompany payables	87	15
Other current liabilities	33	12
Total Current Liabilities	1,565	1,063
Long-term debt	792	792
Pension, other post-retirement and other post-employment liabilities	0	0
Intercompany payables	2,100	2,100
Other non-current liabilities	4	5
TOTAL LIABILITIES	4,461	3,960
TOTAL AON SHAREHOLDERS’ EQUITY	7,946	8,145
Noncontrolling interests	0	0
TOTAL EQUITY	7,946	8,145
TOTAL LIABILITIES AND EQUITY	12,407	12,105
Aon Corporation [Member]
CURRENT ASSETS :
Cash and cash equivalents	154	247	251	199
Short-term investments	101	163
Receivables, net	1	4
Fiduciary assets	0	0
Intercompany receivables	3,982	3,503
Other current assets	109	69
Total Current Assets	4,347	3,986
Goodwill	0	0
Intangible assets, net	0	0
Fixed assets, net	0	0
Investments	69	57
Intercompany receivables	2,163	2,178
Other non-current assets	509	560
Investment in subsidiary	12,165	11,694
TOTAL ASSETS	19,253	18,475
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Short-term debt and current portion of long-term debt	140	0
Accounts payable and accrued liabilities	41	62
Intercompany payables	5,834	5,449
Other current liabilities	47	47
Total Current Liabilities	6,062	5,558
Long-term debt	2,516	2,512
Pension, other post-retirement and other post-employment liabilities	930	925
Intercompany payables	7,267	7,267
Other non-current liabilities	112	159
TOTAL LIABILITIES	16,887	16,421
TOTAL AON SHAREHOLDERS’ EQUITY	2,366	2,054
Noncontrolling interests	0	0
TOTAL EQUITY	2,366	2,054
TOTAL LIABILITIES AND EQUITY	19,253	18,475
Other Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS :
Cash and cash equivalents	1,372	1,246	152	0
Short-term investments	239	360
Receivables, net	2,879	2,892
Fiduciary assets	12,038	11,871
Intercompany receivables	5,878	5,452
Other current assets	538	513
Total Current Assets	22,944	22,334
Goodwill	9,030	8,997
Intangible assets, net	2,500	2,578
Fixed assets, net	785	791
Investments	74	75
Intercompany receivables	2,201	2,201
Other non-current assets	1,477	1,421
Investment in subsidiary	0	0
TOTAL ASSETS	39,011	38,397
CURRENT LIABILITIES
Fiduciary liabilities	12,038	11,871
Short-term debt and current portion of long-term debt	710	707
Accounts payable and accrued liabilities	1,428	1,849
Intercompany payables	4,055	3,677
Other current liabilities	957	866
Total Current Liabilities	19,188	18,970
Long-term debt	361	378
Pension, other post-retirement and other post-employment liabilities	643	682
Intercompany payables	2,163	2,178
Other non-current liabilities	1,818	1,892
TOTAL LIABILITIES	24,173	24,100
TOTAL AON SHAREHOLDERS’ EQUITY	14,778	14,247
Noncontrolling interests	60	50
TOTAL EQUITY	14,838	14,297
TOTAL LIABILITIES AND EQUITY	39,011	38,397
Consolidating Adjustments [Member]
CURRENT ASSETS :
Cash and cash equivalents	(1,188)	(1,016)	0	(39)
Short-term investments	0	0
Receivables, net	0	0
Fiduciary assets	0	0
Intercompany receivables	(9,976)	(9,141)
Other current assets	(70)	(19)
Total Current Assets	(11,234)	(10,176)
Goodwill	0	0
Intangible assets, net	0	0
Fixed assets, net	0	0
Investments	0	0
Intercompany receivables	(11,530)	(11,545)
Other non-current assets	(686)	(704)
Investment in subsidiary	(17,144)	(16,301)
TOTAL ASSETS	(40,594)	(38,726)
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Short-term debt and current portion of long-term debt	0	(4)
Accounts payable and accrued liabilities	(1,188)	(1,016)
Intercompany payables	(9,976)	(9,141)
Other current liabilities	(70)	(19)
Total Current Liabilities	(11,234)	(10,180)
Long-term debt	0	4
Pension, other post-retirement and other post-employment liabilities	0	0
Intercompany payables	(11,530)	(11,545)
Other non-current liabilities	(686)	(704)
TOTAL LIABILITIES	(23,450)	(22,425)
TOTAL AON SHAREHOLDERS’ EQUITY	(17,144)	(16,301)
Noncontrolling interests	0	0
TOTAL EQUITY	(17,144)	(16,301)
TOTAL LIABILITIES AND EQUITY	$ (40,594)	$ (38,726)

XML

Schedule of Other Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other (Expense) Income
Equity earnings	$ 5	$ 2
(Loss) gain on investments	(1)	1
Foreign currency remeasurement gain	19	24
Derivative loss	(23)	(18)
Other	1	0
Other Income	$ 1	$ 9

XML

Share-Based Compensation Plans

3 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation Plans

Share-Based Compensation Plans

The following table summarizes share-based compensation expense recognized in the Condensed Consolidated Statements of Income in Compensation and benefits (in millions):

	Three months ended March 31,
	2014		2013
Restricted share units (“RSUs”)	$	60	$	55
Performance share awards (“PSAs”)	39		11
Share options	—		1
Employee share purchase plans	3		2
Total share-based compensation expense	$	102	$	69

Restricted Share Units

A summary of the status of the Company’s RSUs is as follows (shares in thousands):

	Three months ended March 31,
	2014				2013
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	9,759		$	51	10,432		$	44
Granted	1,146		83		1,764		60
Vested	(1,950	)	51		(2,080	)	46
Forfeited	(125	)	50		(128	)	44
Non-vested at end of period	8,830		56		9,988		47

 ______________________________________________

(1) Represents per share weighted average fair value of award at date of grant.

Performance Share Awards

The vesting of PSAs is contingent upon meeting a level of earnings per share performance over a three-year period. The performance conditions are not considered in the determination of the grant date fair value for these awards. The fair value of PSAs is based upon the market price of an Aon ordinary share at the date of grant. Compensation expense is recognized over the performance period based on management's estimate of the number of units expected to vest. Compensation expense is adjusted to reflect the actual number of shares issued at the end of the programs. The actual issue of shares may range from 0-200% of the target number of PSAs granted, based on the terms of the plan and level of achievement of the related performance target. Dividend equivalents are not paid on PSAs.

Information as of March 31, 2014 regarding the Company’s target PSAs granted and shares that would be issued at current performance levels for PSAs granted during the three months ended March 31, 2014 and the years ended December 31, 2013 and 2012, respectively, is as follows (shares in thousands, dollars in millions, except fair value):

	As of March 31, 2014		As of December 31, 2013		As of December 31, 2012
Target PSAs granted	816		1,135		1,369
Fair value (1)	$	81	$	58	$	47
Number of shares that would be issued based on current performance levels	816		2,243		2,682
Unamortized expense, based on current performance levels	$	65	$	82	$	34

 ______________________________________________

(1) Represents per share weighted average fair value of award at date of grant.

Share Options

The Company did not grant any share options during the three months ended March 31, 2014 or 2013, respectively.

A summary of the status of the Company’s share options and related information is as follows (shares in thousands):

	Three months ended March 31,
	2014				2013
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Beginning outstanding	3,462		$	32	5,611		$	32
Granted	—		—		—		—
Exercised	(416	)	33		(610	)	31
Forfeited and expired	(2	)	36		(10	)	33
Outstanding at end of period	3,044		32		4,991		32
Exercisable at end of period	2,928		32		4,579		32

The weighted average remaining contractual life, in years, of outstanding options was 2.0 years and 2.5 years at March 31, 2014 and 2013, respectively.

The aggregate intrinsic value represents the total pretax intrinsic value, based on options with an exercise price less than the Company’s closing share price of $84.28 as of March 31, 2014, which would have been received by the option holders had those option holders exercised their options as of that date.  At March 31, 2014, the aggregate intrinsic value of options outstanding was $159 million, of which $154 million was exercisable.

Other information related to the Company’s share options is as follows (in millions):

	Three months ended March 31,
	2014		2013
Aggregate intrinsic value of stock options exercised	$	21	$	17
Cash received from the exercise of stock options	14		20
Tax benefit realized from the exercise of stock options	6		3

Unamortized deferred compensation expense, which includes both options and awards, amounted to $365 million as of March 31, 2014, with a remaining weighted-average amortization period of approximately 2.0 years.