Income Taxes - Components of Aon's deferred tax assets and liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Employee benefit plans	$ 661	$ 635
Net operating/capital loss and tax credit carryforwards	399	336
Accrued interest	166	293
Other accrued expenses	102	98
Brokerage fee arrangements (1)	66	66
Deferred revenue	57	65
Investment basis differences	48	56
Other	60	57
Total	1,559	1,606
Valuation allowance on deferred tax assets	(130)	(162)
Total	1,429	1,444
Deferred tax liabilities:
Intangibles and property, plant and equipment	(982)	(961)
Other accrued expenses	(101)	(99)
Deferred costs	(20)	(30)
Unrealized foreign exchange gains	(26)	(29)
Unremitted earnings	(29)	(18)
Other	(50)	(44)
Total	(1,208)	(1,181)
Net deferred tax asset	$ 221	$ 263

Deferred Tax Assets, Brokerage Fee Arrangements

No definition available.

Name:	aon_DeferredTaxAssetsBrokerageFeeArrangements
Namespace Prefix:	aon_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The sum of the tax effects as of the balance sheet date of the amount of (1) excess of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset, and capital losses that cannot be utilized on the tax return during a period that have been carried forward to reduce taxable income or taxes payable in a future year and (2) future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

+ References

No definition available.