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Shareholders' Equity (Details 2) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' equity, including portion attributable to noncontrolling interest | $ 5,826 |  | $ 5,532
Other comprehensive (loss) income before reclassifications, net | 150 |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 16 |  |
Tax benefit (expense) | (4) |  |
Amounts reclassified from accumulated other comprehensive (loss) income, net | 12 |  |
Total other comprehensive income (loss) attributable to Aon shareholders | 162 | $ (287) |
Ending balance | (3,750) |  |
Total |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' equity, including portion attributable to noncontrolling interest | (3,750) |  | (3,912)
Change in Fair Value of Financial Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' equity, including portion attributable to noncontrolling interest | (39) |  | (37)
Other comprehensive (loss) income before reclassifications, net | 4 |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |
Amounts reclassified from accumulated other comprehensive (loss) income | (10) |  |
Tax benefit (expense) | 4 |  |
Amounts reclassified from accumulated other comprehensive (loss) income, net | (6) |  |
Total other comprehensive income (loss) attributable to Aon shareholders | (2) |  |
Foreign Currency Translation Adjustments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' equity, including portion attributable to noncontrolling interest | (1,118) |  | (1,264)
Other comprehensive (loss) income before reclassifications, net | 146 |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 0 |  |
Tax benefit (expense) | 0 |  |
Amounts reclassified from accumulated other comprehensive (loss) income, net | 0 |  |
Total other comprehensive income (loss) attributable to Aon shareholders | 146 |  |
Post-Retirement Benefit Obligation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Stockholders' equity, including portion attributable to noncontrolling interest | (2,593) |  | $ (2,611)
Other comprehensive (loss) income before reclassifications, net | 0 |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 26 |  |
Tax benefit (expense) | (8) |  |
Amounts reclassified from accumulated other comprehensive (loss) income, net | 18 |  |
Total other comprehensive income (loss) attributable to Aon shareholders | $ 18 |  |

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