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Condensed Consolidated Statements of Comprehensive Income - 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 $ 666 $ 520 $ 1,940 $ 1,037
Changes in:        
Unrealized net capital gains and losses 125 193 598 1,197
Unrealized foreign currency translation adjustments 28 (7) 36 12
Unrecognized pension and other postretirement benefit cost 73 21 110 48
Other comprehensive income, after-tax 226 207 744 1,257
Comprehensive income $ 892 $ 727 $ 2,684 $ 2,294