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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Available-for-Sale Securities      
Net Unrealized Gains/Losses, tax impact $ 0 $ 6 $ 19
Reclassification adjustments, tax impact 0 (9) 0
Cash Flow Hedges      
Net Unrealized Gains/Losses, tax impact 2 (11) 0
Reclassification adjustments, tax impact $ 0 $ 0 $ (8)