Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($)	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Cash provided by operating activities - continuing operations	$ 289,000,000	$ 1,152,000,000
Cash provided by operating activities - discontinued operations	64,000,000	323,000,000
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	353,000,000	1,475,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from investments	43,000,000	31,000,000
Payments for investments	(55,000,000)	(47,000,000)
Net purchases of short-term investments - non-fiduciary	(1,344,000,000)	(108,000,000)
Acquisition of businesses, net of cash acquired	(172,000,000)	(198,000,000)
Sale of businesses, net of cash sold	4,194,000,000	104,000,000
Capital expenditures	(125,000,000)	(107,000,000)
Cash provided by (used for) investing activities - continuing operations	2,541,000,000	(325,000,000)
Cash used for investing activities - discontinued operations	(19,000,000)	(46,000,000)
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	2,522,000,000	(371,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,888,000,000)	(1,037,000,000)
Advances from (to) affiliates	0	0
Issuance of shares for employee benefit plans	(118,000,000)	(70,000,000)
Issuance of debt	1,651,000,000	2,729,000,000
Repayment of debt	(1,998,000,000)	(2,308,000,000)
Cash dividends to shareholders	(274,000,000)	(258,000,000)
Noncontrolling interests and other financing activities	(21,000,000)	(71,000,000)
Cash provided by (used for) financing activities - continuing operations	(2,648,000,000)	(1,015,000,000)
Cash used for financing activities - discontinued operations	0	0
CASH USED FOR FINANCING ACTIVITIES	(2,648,000,000)	(1,015,000,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	91,000,000	10,000,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	318,000,000	99,000,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	431,000,000	384,000,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	749,000,000	483,000,000
Cash and cash equivalents from discontinued operations	0	3,000,000	$ 5,000,000	$ 2,000,000
Aon plc
CASH FLOWS FROM OPERATING ACTIVITIES
Cash provided by operating activities - continuing operations	(135,000,000)	219,000,000
Cash provided by operating activities - discontinued operations	0	0
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	(135,000,000)	219,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from investments	0	0
Payments for investments	(16,000,000)	0
Net purchases of short-term investments - non-fiduciary	0	0
Acquisition of businesses, net of cash acquired	0	0
Sale of businesses, net of cash sold	0	0
Capital expenditures	0	0
Cash provided by (used for) investing activities - continuing operations	(16,000,000)	0
Cash used for investing activities - discontinued operations	0	0
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	(16,000,000)	0
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,888,000,000)	(1,037,000,000)
Advances from (to) affiliates	2,722,000,000	166,000,000
Issuance of shares for employee benefit plans	(118,000,000)	(70,000,000)
Issuance of debt	544,000,000	1,588,000,000
Repayment of debt	(835,000,000)	(608,000,000)
Cash dividends to shareholders	(274,000,000)	(258,000,000)
Noncontrolling interests and other financing activities	0	0
Cash provided by (used for) financing activities - continuing operations	151,000,000	(219,000,000)
Cash used for financing activities - discontinued operations	0	0
CASH USED FOR FINANCING ACTIVITIES	151,000,000	(219,000,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0	0
Aon Corporation
CASH FLOWS FROM OPERATING ACTIVITIES
Cash provided by operating activities - continuing operations	999,000,000	(664,000,000)
Cash provided by operating activities - discontinued operations	0	0
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	999,000,000	(664,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from investments	576,000,000	19,000,000
Payments for investments	(25,000,000)	(25,000,000)
Net purchases of short-term investments - non-fiduciary	(1,328,000,000)	(99,000,000)
Acquisition of businesses, net of cash acquired	1,000,000	0
Sale of businesses, net of cash sold	0	0
Capital expenditures	0	0
Cash provided by (used for) investing activities - continuing operations	(776,000,000)	(105,000,000)
Cash used for investing activities - discontinued operations	0	0
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	(776,000,000)	(105,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	1,304,000,000	356,000,000
Issuance of shares for employee benefit plans	0	0
Issuance of debt	1,100,000,000	1,141,000,000
Repayment of debt	(1,150,000,000)	(1,692,000,000)
Cash dividends to shareholders	0	0
Noncontrolling interests and other financing activities	0	0
Cash provided by (used for) financing activities - continuing operations	1,254,000,000	(195,000,000)
Cash used for financing activities - discontinued operations	0	0
CASH USED FOR FINANCING ACTIVITIES	1,254,000,000	(195,000,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,477,000,000	(964,000,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,633,000,000	2,083,000,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	3,110,000,000	1,119,000,000
Other Non-Guarantor Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES
Cash provided by operating activities - continuing operations	987,000,000	1,597,000,000
Cash provided by operating activities - discontinued operations	64,000,000	323,000,000
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	1,051,000,000	1,920,000,000
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from investments	11,000,000	12,000,000
Payments for investments	(571,000,000)	(22,000,000)
Net purchases of short-term investments - non-fiduciary	(16,000,000)	(9,000,000)
Acquisition of businesses, net of cash acquired	(173,000,000)	(198,000,000)
Sale of businesses, net of cash sold	4,194,000,000	104,000,000
Capital expenditures	(125,000,000)	(107,000,000)
Cash provided by (used for) investing activities - continuing operations	3,320,000,000	(220,000,000)
Cash used for investing activities - discontinued operations	(19,000,000)	(46,000,000)
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	3,301,000,000	(266,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	(4,274,000,000)	(670,000,000)
Issuance of shares for employee benefit plans	0	0
Issuance of debt	7,000,000	0
Repayment of debt	(13,000,000)	(8,000,000)
Cash dividends to shareholders	0	0
Noncontrolling interests and other financing activities	(21,000,000)	(71,000,000)
Cash provided by (used for) financing activities - continuing operations	(4,301,000,000)	(749,000,000)
Cash used for financing activities - discontinued operations	0	0
CASH USED FOR FINANCING ACTIVITIES	(4,301,000,000)	(749,000,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	91,000,000	10,000,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	142,000,000	915,000,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	660,000,000	1,242,000,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	802,000,000	2,157,000,000
Consolidation Adjustments
CASH FLOWS FROM OPERATING ACTIVITIES
Cash provided by operating activities - continuing operations	(1,562,000,000)	0
Cash provided by operating activities - discontinued operations	0	0
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	(1,562,000,000)	0
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from investments	(544,000,000)	0
Payments for investments	557,000,000	0
Net purchases of short-term investments - non-fiduciary	0	0
Acquisition of businesses, net of cash acquired	0	0
Sale of businesses, net of cash sold	0	0
Capital expenditures	0	0
Cash provided by (used for) investing activities - continuing operations	13,000,000	0
Cash used for investing activities - discontinued operations	0	0
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	13,000,000	0
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	248,000,000	148,000,000
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
Noncontrolling interests and other financing activities	0	0
Cash provided by (used for) financing activities - continuing operations	248,000,000	148,000,000
Cash used for financing activities - discontinued operations	0	0
CASH USED FOR FINANCING ACTIVITIES	248,000,000	148,000,000
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(1,301,000,000)	148,000,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	(1,862,000,000)	(2,941,000,000)
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ (3,163,000,000)	$ (2,793,000,000)

The cash inflow or outflow from sales or purchases of marketable securities.

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Proceeds (Payment) Towards Issuance of Shares Under Incentive and Share-based Compensation Plans, Net of Payments Related to Tax Withholding for Share-based Compensation

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For the entity and the disposal group, cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of cash inflow (outflow) of financing activities of discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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The increase (decrease) in obligations owed to an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Amount of cash outflow to acquire investments classified as other.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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This element represents the cash inflow during the period from the sale of a component of the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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