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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 382 | $ 228 | $ 287 | $ 676 | $ 353 | $ 153 | $ 58 | $ 610 | $ 1,573 | $ 1,174 | $ 1,263
Less: Net income attributable to noncontrolling interests | 8 | 6 | 10 | 17 | 8 | 6 | 10 | 16 | 41 | 40 | 37
Net income attributable to Aon shareholders | $ 374 | $ 222 | $ 277 | $ 659 | $ 345 | $ 147 | $ 48 | $ 594 | 1,532 | 1,134 | 1,226
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Change in fair value of financial instruments |  |  |  |  |  |  |  |  | 3 | 11 | 12
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | 14 | (444) | 390
Postretirement benefit obligation |  |  |  |  |  |  |  |  | (141) | 17 | 19
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | (124) | (416) | 421
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | (4) | 5
Total other comprehensive income (loss) attributable to Aon shareholders |  |  |  |  |  |  |  |  | (124) | (412) | 416
Comprehensive income attributable to Aon shareholders |  |  |  |  |  |  |  |  | $ 1,408 | $ 722 | $ 1,642

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