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Shareholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | $ 4,862 | $ 5,385 | $ 4,219 | $ 5,140
Other comprehensive income (loss) before reclassifications, net |  |  | 25 |
Amounts reclassified from accumulated other comprehensive income: |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 60 |
Tax expense |  |  | (13) |
Amounts reclassified from accumulated other comprehensive income, net |  |  | 47 |
Total other comprehensive income (loss) attributable to Aon shareholders | (97) | (333) | 72 | (27)
Ending Balance | 3,913 | $ 4,618 | 3,913 | $ 4,618
Total |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (3,909) |
Amounts reclassified from accumulated other comprehensive income: |  |  |  |
Ending Balance | (3,837) |  | (3,837) |
Change in Fair Value of Financial Instruments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (15) |
Other comprehensive income (loss) before reclassifications, net |  |  | (8) |
Amounts reclassified from accumulated other comprehensive income: |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 8 |
Tax expense |  |  | (1) |
Amounts reclassified from accumulated other comprehensive income, net |  |  | 7 |
Total other comprehensive income (loss) attributable to Aon shareholders |  |  | (1) |
Ending Balance | (16) |  | (16) |
Foreign Currency Translation Adjustments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (1,319) |
Other comprehensive income (loss) before reclassifications, net |  |  | 28 |
Amounts reclassified from accumulated other comprehensive income: |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 0 |
Tax expense |  |  | 0 |
Amounts reclassified from accumulated other comprehensive income, net |  |  | 0 |
Total other comprehensive income (loss) attributable to Aon shareholders |  |  | 28 |
Ending Balance | (1,291) |  | (1,291) |
Postretirement Benefit Obligation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (2,575) |
Other comprehensive income (loss) before reclassifications, net |  |  | 5 |
Amounts reclassified from accumulated other comprehensive income: |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 52 |
Tax expense |  |  | (12) |
Amounts reclassified from accumulated other comprehensive income, net |  |  | 40 |
Total other comprehensive income (loss) attributable to Aon shareholders |  |  | 45 |
Ending Balance | $ (2,530) |  | $ (2,530) |

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