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Shareholders' Equity - Components of Accumulated other comprehensive loss, net of related tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance | $ 6,059 | $ 6,527 | $ 8,091
Other comprehensive loss before reclassifications | (791) | (389) | (1,068)
Tax benefit | 77 | 23 | 221
Other comprehensive loss before reclassifications, net | (714) | (366) | (847)
Amounts reclassified from accumulated other comprehensive loss | 332 | 128 | 126
Tax benefit | (107) | (51) | (39)
Amounts reclassified from accumulated other comprehensive loss, net | 225 | 77 | 87
Total other comprehensive loss attributable to Aon shareholders | (489) | (289) | (760)
Balance | 5,532 | 6,059 | 6,527
Change in Fair Value of Investments |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance | (25) | (17) | (21)
Other comprehensive loss before reclassifications | (25) | (4) | (13)
Tax benefit | 6 | 1 | 4
Other comprehensive loss before reclassifications, net | (19) | (3) | (9)
Amounts reclassified from accumulated other comprehensive loss | 10 | 11 | 20
Tax benefit | (3) | (16) | (7)
Amounts reclassified from accumulated other comprehensive loss, net | 7 | (5) | 13
Total other comprehensive loss attributable to Aon shareholders | (12) | (8) | 4
Balance | (37) | (25) | (17)
Foreign Currency Translation Adjustments |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance | (771) | (335) | 169
Other comprehensive loss before reclassifications | (490) | (467) | (492)
Tax benefit | (3) | 31 | (12)
Other comprehensive loss before reclassifications, net | (493) | (436) | (504)
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0
Tax benefit | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss, net | 0 | 0 | 0
Total other comprehensive loss attributable to Aon shareholders | (493) | (436) | (504)
Balance | (1,264) | (771) | (335)
Post-retirement Benefit Obligations |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance | (2,627) | (2,782) | (2,522)
Other comprehensive loss before reclassifications | (276) | 82 | (563)
Tax benefit | 74 | (9) | 229
Other comprehensive loss before reclassifications, net | (202) | 73 | (334)
Amounts reclassified from accumulated other comprehensive loss | 322 | 117 | 106
Tax benefit | (104) | (35) | (32)
Amounts reclassified from accumulated other comprehensive loss, net | 218 | 82 | 74
Total other comprehensive loss attributable to Aon shareholders | 16 | 155 | (260)
Balance | (2,611) | (2,627) | (2,782)
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance | (3,423) | (3,134) | (2,374)
Balance | $ (3,912) | $ (3,423) | $ (3,134)

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