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Guarantee of Registered Securities - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 459 | $ 326 | $ 308 | $ 337 | $ 540 | $ 311 | $ 214 | $ 357 | $ 645 | $ 971 | $ 1,430 | $ 1,422 | $ 1,431
Less: Net income attributable to noncontrolling interests | 7 | 7 | 8 | 12 | 6 | 8 | 10 | 13 |  |  | 34 | 37 | 34
Net income attributable to Aon shareholders | $ 452 | $ 319 | $ 300 | $ 325 | $ 534 | $ 303 | $ 204 | $ 344 |  |  | 1,396 | 1,385 | 1,397
Change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | 4
Net change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  | (12) | (8) | 4
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  | (495) | (442) | (507)
Post-retirement benefit obligation |  |  |  |  |  |  |  |  |  |  | 16 | 155 | (260)
Total other comprehensive loss |  |  |  |  |  |  |  |  |  |  | (491) | (295) | (763)
Equity in other comprehensive loss of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Other comprehensive loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (2) | (6) | (3)
Total other comprehensive loss attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | (489) | (289) | (760)
Comprehensive income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 907 | 1,096 | 637
Aon plc |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 1,414 | 1,385 | 1,397
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 1,414 | 1,385 | 1,397
Change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | 0
Net change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  | (2) | 0 | 0
Post-retirement benefit obligation |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other comprehensive loss |  |  |  |  |  |  |  |  |  |  | (2) | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | (505) | (289) | (760)
Less: Other comprehensive loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other comprehensive loss attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | (507) | (289) | (760)
Comprehensive income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 907 | 1,096 | 637
Aon Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 379 | 496 | 546
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 379 | 496 | 546
Change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | (3)
Net change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  | (1) | 0 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  | 21 | (47) | (31)
Post-retirement benefit obligation |  |  |  |  |  |  |  |  |  |  | 68 | 12 | (315)
Total other comprehensive loss |  |  |  |  |  |  |  |  |  |  | 88 | (35) | (349)
Equity in other comprehensive loss of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | (547) | (259) | (409)
Less: Other comprehensive loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other comprehensive loss attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | (459) | (294) | (758)
Comprehensive income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | (80) | 202 | (212)
Other Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 2,635 | 2,311 | 2,134
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 34 | 37 | 34
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 2,601 | 2,274 | 2,100
Change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | 7
Net change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  | (11) | (8) |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  | (532) | (395) | (476)
Post-retirement benefit obligation |  |  |  |  |  |  |  |  |  |  | (52) | 143 | 55
Total other comprehensive loss |  |  |  |  |  |  |  |  |  |  | (595) | (260) | (414)
Equity in other comprehensive loss of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | (459) | (294) | (758)
Less: Other comprehensive loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (2) | (6) | (3)
Total other comprehensive loss attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | (1,052) | (548) | (1,169)
Comprehensive income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 1,549 | 1,726 | 931
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | (2,998) | (2,770) | (2,646)
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | (2,998) | (2,770) | (2,646)
Change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  |  |  | 0
Net change in fair value of financial instruments |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  | 18 | 0 | 0
Post-retirement benefit obligation |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other comprehensive loss |  |  |  |  |  |  |  |  |  |  | 18 | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | 1,511 | 842 | 1,927
Less: Other comprehensive loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total other comprehensive loss attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | 1,529 | 842 | 1,927
Comprehensive income attributable to Aon shareholders |  |  |  |  |  |  |  |  |  |  | $ (1,469) | $ (1,928) | $ (719)

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