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Income Taxes - Components of Aon's deferred tax assets and liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Employee benefit plans | $ 635 | $ 739
Net operating/capital loss and tax credit carryforwards | 349 | 295
Accrued interest | 293 | 303
Other accrued expenses | 98 | 44
Deferred revenue | 65 | 40
Investment basis differences | 56 | 45
Other | 56 | 6
Total | 1,552 | 1,472
Valuation allowance on deferred tax assets | (175) | (205)
Total | 1,377 | 1,267
Deferred tax liabilities: |  |
Intangibles and property, plant and equipment | (961) | (1,058)
Other accrued expenses | (99) | (40)
Deferred costs | (30) | (28)
Unrealized foreign exchange gains | (29) | (44)
Unremitted earnings | (18) | (28)
Other | (44) | (28)
Total | (1,181) | (1,226)
Net deferred tax asset | $ 196 | $ 41

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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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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill and from property, plant, and equipment. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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