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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 630 $ 597
Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Changes in net unrealized gain on securities 679 (855)
Changes in OTTI losses recognized in other comprehensive income 1 (2)
Changes in net gain on cash flow hedging instruments 5 (44)
Changes in foreign currency translation adjustments 1 (6)
Changes in pension and other postretirement plan adjustments 8 10
OCI, net of tax 694 (897)
Comprehensive income (loss) $ 1,324 $ (300)