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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | $ 153 | $ 192 | $ 821 | $ 1,275
Less: Net income attributable to noncontrolling interests | 6 | 7 | 32 | 30
Net income attributable to Aon shareholders | 147 | 185 | 789 | 1,245
Change in fair value of financial instruments | 1 | 11 | 14 | 13
Foreign currency translation adjustments | (50) | 243 | (263) | 434
Postretirement benefit obligation | (62) | 18 | 108 | 56
Total other comprehensive (loss) income | (111) | 272 | (141) | 503
Equity in other comprehensive income (loss) of subsidiaries, net of tax | 0 | 0 | 0 | 0
Less: Other comprehensive loss attributable to noncontrolling interests | (3) | 7 | (6) | 3
Total other comprehensive income (loss) attributable to Aon shareholders | (108) | 265 | (135) | 500
Comprehensive income (loss) attributable to Aon shareholders | 39 | 450 | 654 | 1,745
Aon plc |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 145 | 185 | 802 | 1,227
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 145 | 185 | 802 | 1,227
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
Total other comprehensive (loss) income | 0 | 0 | 0 | 0
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (106) | 265 | (148) | 518
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | (106) | 265 | (148) | 518
Comprehensive income (loss) attributable to Aon shareholders | 39 | 450 | 654 | 1,745
Aon Corporation |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | (364) | (216) | 232 | 497
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | (364) | (216) | 232 | 497
Change in fair value of financial instruments | (2) | 3 | (3) | 3
Foreign currency translation adjustments | 0 | 0 | 0 | 0
Postretirement benefit obligation | 12 | 7 | 34 | 23
Total other comprehensive (loss) income | 10 | 10 | 31 | 26
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (134) | 245 | (194) | 480
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | (124) | 255 | (163) | 506
Comprehensive income (loss) attributable to Aon shareholders | (488) | 39 | 69 | 1,003
Other Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | (78) | 93 | 1,746 | 2,320
Less: Net income attributable to noncontrolling interests | 6 | 7 | 32 | 30
Net income attributable to Aon shareholders | (84) | 86 | 1,714 | 2,290
Change in fair value of financial instruments | 3 | 8 | 17 | 10
Foreign currency translation adjustments | (48) | 243 | (276) | 452
Postretirement benefit obligation | (74) | 11 | 74 | 33
Total other comprehensive (loss) income | (119) | 262 | (185) | 495
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (124) | 255 | (163) | 506
Less: Other comprehensive loss attributable to noncontrolling interests | (3) | 7 | (6) | 3
Total other comprehensive income (loss) attributable to Aon shareholders | (240) | 510 | (342) | 998
Comprehensive income (loss) attributable to Aon shareholders | (324) | 596 | 1,372 | 3,288
Consolidation Adjustments |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 450 | 130 | (1,959) | (2,769)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 450 | 130 | (1,959) | (2,769)
Change in fair value of financial instruments | 0 | 0 | 0 | 0
Foreign currency translation adjustments | (2) | 0 | 13 | (18)
Postretirement benefit obligation | 0 | 0 | 0 | 0
Total other comprehensive (loss) income | (2) | 0 | 13 | (18)
Equity in other comprehensive income (loss) of subsidiaries, net of tax | 364 | (765) | 505 | (1,504)
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | 362 | (765) | 518 | (1,522)
Comprehensive income (loss) attributable to Aon shareholders | $ 812 | $ (635) | $ (1,441) | $ (4,291)

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