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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | $ 303 | $ 315 | $ 832 | $ 964
Less: Net income attributable to noncontrolling interests | 8 | 6 | 31 | 26
Net income attributable to Aon shareholders | 295 | 309 | 801 | 938
Change in fair value of financial instruments | (10) | (8) | (11) | 12
Foreign currency translation adjustments | (229) | (318) | (376) | (228)
Post-retirement benefit obligation | 18 | 26 | 62 | 70
Total other comprehensive (loss) | (221) | (300) | (325) | (146)
Equity in other comprehensive loss of subsidiaries, net of tax | 0 | 0 | 0 | 0
Less: Other comprehensive (loss) income attributable to noncontrolling interests | (4) | 0 | (6) | (2)
Total other comprehensive (loss) attributable to Aon shareholders | (217) | (300) | (319) | (144)
Comprehensive income attributable to Aon shareholders | 78 | 9 | 482 | 794
Aon plc [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 295 | 309 | 801 | 938
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 295 | 309 | 801 | 938
Change in fair value of financial instruments | 0 | 0 | 0 | 0
Foreign currency translation adjustments | 0 | 0 | 0 | 0
Post-retirement benefit obligation | 0 | 0 | 0 | 0
Total other comprehensive (loss) | 0 | 0 | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax | (217) | (300) | (319) | (144)
Less: Other comprehensive (loss) income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive (loss) attributable to Aon shareholders | (217) | (300) | (319) | (144)
Comprehensive income attributable to Aon shareholders | 78 | 9 | 482 | 794
Aon Corporation [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 234 | 162 | 600 | 635
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 234 | 162 | 600 | 635
Change in fair value of financial instruments | (1) | (1) | 0 | (1)
Foreign currency translation adjustments | (24) | (17) | (43) | (19)
Post-retirement benefit obligation | 8 | 6 | 25 | 17
Total other comprehensive (loss) | (17) | (12) | (18) | (3)
Equity in other comprehensive loss of subsidiaries, net of tax | (196) | (285) | (290) | (142)
Less: Other comprehensive (loss) income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive (loss) attributable to Aon shareholders | (213) | (297) | (308) | (145)
Comprehensive income attributable to Aon shareholders | 21 | (135) | 292 | 490
Other Non-Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 662 | 533 | 1,757 | 1,767
Less: Net income attributable to noncontrolling interests | 8 | 6 | 31 | 26
Net income attributable to Aon shareholders | 654 | 527 | 1,726 | 1,741
Change in fair value of financial instruments | (9) | (7) | (11) | 13
Foreign currency translation adjustments | (205) | (301) | (333) | (209)
Post-retirement benefit obligation | 10 | 20 | 37 | 53
Total other comprehensive (loss) | (204) | (288) | (307) | (143)
Equity in other comprehensive loss of subsidiaries, net of tax | (213) | 0 | (308) | 0
Less: Other comprehensive (loss) income attributable to noncontrolling interests | (4) | 0 | (6) | (2)
Total other comprehensive (loss) attributable to Aon shareholders | (413) | (288) | (609) | (141)
Comprehensive income attributable to Aon shareholders | 241 | 239 | 1,117 | 1,600
Consolidating Adjustments [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | (888) | (689) | (2,326) | (2,376)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | (888) | (689) | (2,326) | (2,376)
Change in fair value of financial instruments | 0 | 0 | 0 | 0
Foreign currency translation adjustments | 0 | 0 | 0 | 0
Post-retirement benefit obligation | 0 | 0 | 0 | 0
Total other comprehensive (loss) | 0 | 0 | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax | 626 | 585 | 917 | 286
Less: Other comprehensive (loss) income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive (loss) attributable to Aon shareholders | 626 | 585 | 917 | 286
Comprehensive income attributable to Aon shareholders | $ (262) | $ (104) | $ (1,409) | $ (2,090)

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