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Guarantee of Registered Securities - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Net income | $ 228 | $ 287 | $ 676 | $ 153 | $ 58 | $ 610 | $ 1,191 | $ 821
Less: Net income attributable to noncontrolling interests | 6 |  |  | 6 |  |  | 33 | 32
Net income attributable to Aon shareholders | 222 |  |  | 147 |  |  | 1,158 | 789
Change in fair value of financial instruments | (2) | (8) | 7 | 1 | (1) | 14 | (3) | 14
Foreign currency translation adjustments | (212) | (103) | 133 | (50) | (460) | 247 | (182) | (263)
Postretirement benefit obligation | 17 | $ 14 | $ 31 | (62) | $ 122 | $ 48 | 62 | 108
Net current period other comprehensive income (loss) | (197) |  |  | (111) |  |  | (123) | (141)
Equity in other comprehensive income (loss) of subsidiaries, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Less: Other comprehensive loss attributable to noncontrolling interests | (4) |  |  | (3) |  |  | (2) | (6)
Total other comprehensive loss attributable to Aon shareholders | (193) |  |  | (108) |  |  | (121) | (135)
Comprehensive income (loss) attributable to Aon shareholders | 29 |  |  | 39 |  |  | 1,037 | 654
Aon plc |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Net income | 244 |  |  | 145 |  |  | 1,175 | 802
Less: Net income attributable to noncontrolling interests | 0 |  |  | 0 |  |  | 0 | 0
Net income attributable to Aon shareholders | 244 |  |  | 145 |  |  | 1,175 | 802
Change in fair value of financial instruments | 0 |  |  | 0 |  |  | 0 | 0
Foreign currency translation adjustments | 0 |  |  | 0 |  |  | 0 | 0
Postretirement benefit obligation | 0 |  |  | 0 |  |  | 0 | 0
Net current period other comprehensive income (loss) | 0 |  |  | 0 |  |  | 0 | 0
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (215) |  |  | (106) |  |  | (138) | (148)
Less: Other comprehensive loss attributable to noncontrolling interests | 0 |  |  | 0 |  |  | 0 | 0
Total other comprehensive loss attributable to Aon shareholders | (215) |  |  | (106) |  |  | (138) | (148)
Comprehensive income (loss) attributable to Aon shareholders | 29 |  |  | 39 |  |  | 1,037 | 654
Aon Corporation |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Net income | (36) |  |  | (364) |  |  | 504 | 234
Less: Net income attributable to noncontrolling interests | 0 |  |  | 0 |  |  | 0 | 0
Net income attributable to Aon shareholders | (36) |  |  | (364) |  |  | 504 | 234
Change in fair value of financial instruments | 0 |  |  | (2) |  |  | 2 | (3)
Foreign currency translation adjustments | 0 |  |  | 0 |  |  | 0 | 0
Postretirement benefit obligation | 10 |  |  | 12 |  |  | 42 | 34
Net current period other comprehensive income (loss) | 10 |  |  | 10 |  |  | 44 | 31
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (220) |  |  | (134) |  |  | (223) | (194)
Less: Other comprehensive loss attributable to noncontrolling interests | 0 |  |  | 0 |  |  | 0 | 0
Total other comprehensive loss attributable to Aon shareholders | (210) |  |  | (124) |  |  | (179) | (163)
Comprehensive income (loss) attributable to Aon shareholders | (246) |  |  | (488) |  |  | 325 | 71
Other Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Net income | 443 |  |  | (78) |  |  | 2,388 | 1,748
Less: Net income attributable to noncontrolling interests | 6 |  |  | 6 |  |  | 33 | 32
Net income attributable to Aon shareholders | 437 |  |  | (84) |  |  | 2,355 | 1,716
Change in fair value of financial instruments | (2) |  |  | 3 |  |  | (5) | 17
Foreign currency translation adjustments | (234) |  |  | (48) |  |  | (199) | (276)
Postretirement benefit obligation | 7 |  |  | (74) |  |  | 20 | 74
Net current period other comprehensive income (loss) | (229) |  |  | (119) |  |  | (184) | (185)
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (210) |  |  | (124) |  |  | (179) | (163)
Less: Other comprehensive loss attributable to noncontrolling interests | (4) |  |  | (3) |  |  | (2) | (6)
Total other comprehensive loss attributable to Aon shareholders | (435) |  |  | (240) |  |  | (361) | (342)
Comprehensive income (loss) attributable to Aon shareholders | 2 |  |  | (324) |  |  | 1,994 | 1,374
Consolidation Adjustments |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Net income | (423) |  |  | 450 |  |  | (2,876) | (1,963)
Less: Net income attributable to noncontrolling interests | 0 |  |  | 0 |  |  | 0 | 0
Net income attributable to Aon shareholders | (423) |  |  | 450 |  |  | (2,876) | (1,963)
Change in fair value of financial instruments | 0 |  |  | 0 |  |  | 0 | 0
Foreign currency translation adjustments | 22 |  |  | (2) |  |  | 17 | 13
Postretirement benefit obligation | 0 |  |  | 0 |  |  | 0 | 0
Net current period other comprehensive income (loss) | 22 |  |  | (2) |  |  | 17 | 13
Equity in other comprehensive income (loss) of subsidiaries, net of tax | 645 |  |  | 364 |  |  | 540 | 505
Less: Other comprehensive loss attributable to noncontrolling interests | 0 |  |  | 0 |  |  | 0 | 0
Total other comprehensive loss attributable to Aon shareholders | 667 |  |  | 362 |  |  | 557 | 518
Comprehensive income (loss) attributable to Aon shareholders | $ 244 |  |  | $ 812 |  |  | $ (2,319) | $ (1,445)

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