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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

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- 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. + Details
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