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Guarantee of Registered Securities - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | $ 188 | $ 313 | $ 529 | $ 649
Less: Net income attributable to noncontrolling interests | 10 | 9 | 23 | 20
Net income attributable to Aon shareholders | 178 | 304 | 506 | 629
Change in fair value of financial instruments | (6) | 10 | (1) | 20
Foreign currency translation adjustments | 175 | 74 | (147) | 90
Post-retirement benefit obligation | 21 | 18 | 44 | 44
Total other comprehensive (loss) income | 190 | 102 | (104) | 154
Equity in other comprehensive loss of subsidiaries, net of tax | 0 | 0 | 0 | 0
Less: Other comprehensive (loss) income attributable to noncontrolling interests | (1) | 0 | (2) | (2)
Total other comprehensive (loss) income attributable to Aon shareholders | 191 | 102 | (102) | 156
Comprehensive income attributable to Aon shareholders | 369 | 406 | 404 | 785
Aon plc [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 178 | 304 | 506 | 629
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 178 | 304 | 506 | 629
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) income | 0 | 0 | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax | 191 | 102 | (102) | 156
Less: Other comprehensive (loss) income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive (loss) income attributable to Aon shareholders | 191 | 102 | (102) | 156
Comprehensive income attributable to Aon shareholders | 369 | 406 | 404 | 785
Aon Corporation [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 64 | 220 | 366 | 475
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 64 | 220 | 366 | 475
Change in fair value of financial instruments | 2 | (1) | 1 | 0
Foreign currency translation adjustments | 4 | 15 | (19) | (2)
Post-retirement benefit obligation | 9 | 5 | 17 | 11
Total other comprehensive (loss) income | 15 | 19 | (1) | 9
Equity in other comprehensive loss of subsidiaries, net of tax | 173 | 73 | (94) | 142
Less: Other comprehensive (loss) income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive (loss) income attributable to Aon shareholders | 188 | 92 | (95) | 151
Comprehensive income attributable to Aon shareholders | 252 | 312 | 271 | 626
Other Non-Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 337 | 575 | 1,096 | 1,237
Less: Net income attributable to noncontrolling interests | 10 | 9 | 23 | 20
Net income attributable to Aon shareholders | 327 | 566 | 1,073 | 1,217
Change in fair value of financial instruments | (8) | 11 | (2) | 20
Foreign currency translation adjustments | 171 | 59 | (128) | 92
Post-retirement benefit obligation | 12 | 13 | 27 | 33
Total other comprehensive (loss) income | 175 | 83 | (103) | 145
Equity in other comprehensive loss of subsidiaries, net of tax | 188 | 0 | (95) | 0
Less: Other comprehensive (loss) income attributable to noncontrolling interests | (1) | 0 | (2) | (2)
Total other comprehensive (loss) income attributable to Aon shareholders | 364 | 83 | (196) | 147
Comprehensive income attributable to Aon shareholders | 691 | 649 | 877 | 1,364
Consolidating Adjustments [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | (391) | (786) | (1,439) | (1,692)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | (391) | (786) | (1,439) | (1,692)
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) income | 0 | 0 | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax | (552) | (175) | 291 | (298)
Less: Other comprehensive (loss) income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive (loss) income attributable to Aon shareholders | (552) | (175) | 291 | (298)
Comprehensive income attributable to Aon shareholders | $ (943) | $ (961) | $ (1,148) | $ (1,990)

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