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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 327 | $ 341
Less: Net income attributable to noncontrolling interests | 12 | 13
Net income attributable to Aon shareholders | 315 | 328
Other comprehensive (loss) income, net of tax: |  |
Change in fair value of financial instruments | (7) | 5
Foreign currency translation adjustments | (79) | (322)
Post-retirement benefit obligation | (201) | 23
Total other comprehensive (loss) | (287) | (294)
Less: Other comprehensive (loss) income attributable to noncontrolling interests | 0 | (1)
Total other comprehensive (loss) attributable to Aon shareholders | (287) | (293)
Comprehensive income attributable to Aon shareholders | $ 28 | $ 35

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