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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 192 $ 326 $ 1,275 $ 971
Less: Net income attributable to noncontrolling interests 7 7 30 27
Net income attributable to Aon shareholders 185 319 1,245 944
Other comprehensive income (loss), net of tax:        
Change in fair value of financial instruments 11 0 13 (11)
Foreign currency translation adjustments 243 (89) 434 (227)
Postretirement benefit obligation 18 18 56 (132)
Total other comprehensive income (loss) 272 (71) 503 (370)
Less: Other comprehensive income attributable to noncontrolling interests 7 0 3 0
Total other comprehensive income (loss) attributable to Aon shareholders 265 (71) 500 (370)
Comprehensive income (loss) attributable to Aon shareholders $ 450 $ 248 $ 1,745 $ 574