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Guarantee of Registered Securities - Condensed Consolidating Statement of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |
Net income | $ 336 | $ 272
Less: Net income attributable to noncontrolling interests | 11 | 11
Net income attributable to Aon shareholders | 325 | 261
Change in fair value of investments | 1 | 0
Change in fair value of derivatives | 9 | (14)
Foreign currency translation adjustments | 16 | (174)
Post-retirement benefit obligation | 26 | 23
Total other comprehensive income (loss) | 52 | (165)
Equity in other comprehensive loss of subsidiaries, net of tax | 0 | 0
Less: Other comprehensive income attributable to noncontrolling interests | (2) | 0
Total other comprehensive income (loss) attributable to Aon shareholders | 54 | (165)
Comprehensive income attributable to Aon shareholders | 379 | 96
Aon plc [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | 325 | 261
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 325 | 261
Change in fair value of investments | 0 | 0
Change in fair value of derivatives | 0 | 0
Foreign currency translation adjustments | 0 | 0
Post-retirement benefit obligation | 0 | 0
Total other comprehensive income (loss) | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax | 54 | (165)
Less: Other comprehensive income attributable to noncontrolling interests | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | 54 | (165)
Comprehensive income attributable to Aon shareholders | 379 | 96
Aon Corporation [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | 200 | 247
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 200 | 247
Change in fair value of investments | 0 | 0
Change in fair value of derivatives | 1 | 1
Foreign currency translation adjustments | (17) | (8)
Post-retirement benefit obligation | 6 | 7
Total other comprehensive income (loss) | (10) | 0
Equity in other comprehensive loss of subsidiaries, net of tax | 69 | (164)
Less: Other comprehensive income attributable to noncontrolling interests | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | 59 | (164)
Comprehensive income attributable to Aon shareholders | 259 | 83
Other Non-Guarantor Subsidiaries [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | 354 | 300
Less: Net income attributable to noncontrolling interests | 11 | 11
Net income attributable to Aon shareholders | 343 | 289
Change in fair value of investments | 1 | 0
Change in fair value of derivatives | 8 | (15)
Foreign currency translation adjustments | 33 | (166)
Post-retirement benefit obligation | 20 | 16
Total other comprehensive income (loss) | 62 | (165)
Equity in other comprehensive loss of subsidiaries, net of tax | 0 | 0
Less: Other comprehensive income attributable to noncontrolling interests | (2) | 0
Total other comprehensive income (loss) attributable to Aon shareholders | 64 | (165)
Comprehensive income attributable to Aon shareholders | 407 | 124
Consolidating Adjustments [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | (543) | (536)
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | (543) | (536)
Change in fair value of investments | 0 | 0
Change in fair value of derivatives | 0 | 0
Foreign currency translation adjustments | 0 | 0
Post-retirement benefit obligation | 0 | 0
Total other comprehensive income (loss) | 0 | 0
Equity in other comprehensive loss of subsidiaries, net of tax | (123) | 329
Less: Other comprehensive income attributable to noncontrolling interests | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | (123) | 329
Comprehensive income attributable to Aon shareholders | $ (666) | $ (207)

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