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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 1,982 $ 3,751 $ 4,050
After Tax      
Net unrealized gains (losses) on securities available for sale 21 (166) (248)
Net changes in securities held to maturity 97 104 96
Net unrealized gains (losses) on cash flow hedges (203) (198) 110
Foreign currency translation adjustments 84 (79) (135)
Other 24 6 (9)
Other comprehensive income (loss), net of tax 23 (333) (186)
Comprehensive income $ 2,005 $ 3,418 $ 3,864