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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | $ 58 | $ 778 | $ 668 | $ 1,083
Less: Net income attributable to noncontrolling interests | 10 | 9 | 26 | 23
Net income attributable to Aon shareholders | 48 | 769 | 642 | 1,060
Change in fair value of financial instruments | (1) | 4 | 13 | 2
Foreign currency translation adjustments | (460) | 44 | (213) | 191
Postretirement benefit obligation | 122 | 20 | 170 | 38
Total other comprehensive (loss) income | (339) | 68 | (30) | 231
Equity in other comprehensive income (loss) of subsidiaries, net of tax | 0 | 0 | 0 | 0
Less: Other comprehensive loss attributable to noncontrolling interests | (6) | (5) | (3) | (4)
Total other comprehensive income (loss) attributable to Aon shareholders | (333) | 73 | (27) | 235
Comprehensive income (loss) attributable to Aon shareholders | (285) | 842 | 615 | 1,295
Aon plc |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 66 | 759 | 657 | 1,042
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 66 | 759 | 657 | 1,042
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 | (351) | 83 | (42) | 253
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | (351) | 83 | (42) | 253
Comprehensive income (loss) attributable to Aon shareholders | (285) | 842 | 615 | 1,295
Aon Corporation |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 15 | 531 | 596 | 713
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | 15 | 531 | 596 | 713
Change in fair value of financial instruments | (4) | 2 | (1) | 0
Foreign currency translation adjustments | 0 | 0 | 0 | 0
Postretirement benefit obligation | 11 | 8 | 22 | 16
Total other comprehensive (loss) income | 7 | 10 | 21 | 16
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (345) | 71 | (60) | 235
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | (338) | 81 | (39) | 251
Comprehensive income (loss) attributable to Aon shareholders | (323) | 612 | 557 | 964
Other Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 386 | 1,514 | 1,824 | 2,227
Less: Net income attributable to noncontrolling interests | 10 | 9 | 26 | 23
Net income attributable to Aon shareholders | 376 | 1,505 | 1,798 | 2,204
Change in fair value of financial instruments | 3 | 2 | 14 | 2
Foreign currency translation adjustments | (478) | 54 | (228) | 209
Postretirement benefit obligation | 111 | 12 | 148 | 22
Total other comprehensive (loss) income | (364) | 68 | (66) | 233
Equity in other comprehensive income (loss) of subsidiaries, net of tax | (338) | 81 | (39) | 251
Less: Other comprehensive loss attributable to noncontrolling interests | (6) | (5) | (3) | (4)
Total other comprehensive income (loss) attributable to Aon shareholders | (696) | 154 | (102) | 488
Comprehensive income (loss) attributable to Aon shareholders | (320) | 1,659 | 1,696 | 2,692
Consolidation Adjustments |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | (409) | (2,026) | (2,409) | (2,899)
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0
Net income attributable to Aon shareholders | (409) | (2,026) | (2,409) | (2,899)
Change in fair value of financial instruments | 0 | 0 | 0 | 0
Foreign currency translation adjustments | 18 | (10) | 15 | (18)
Postretirement benefit obligation | 0 | 0 | 0 | 0
Total other comprehensive (loss) income | 18 | (10) | 15 | (18)
Equity in other comprehensive income (loss) of subsidiaries, net of tax | 1,034 | (235) | 141 | (739)
Less: Other comprehensive loss attributable to noncontrolling interests | 0 | 0 | 0 | 0
Total other comprehensive income (loss) attributable to Aon shareholders | 1,052 | (245) | 156 | (757)
Comprehensive income (loss) attributable to Aon shareholders | $ 643 | $ (2,271) | $ (2,253) | $ (3,656)

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