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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investment securities available-for-sale, Amortized Cost $ 12,275 $ 12,225
Investment securities available-for-sale securities, Gross Unrealized Gains 55 36
Investment securities available-for-sale securities, Gross Unrealized Losses 118 216
Investment securities available-for-sale, Fair Value 12,212 12,045
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 2,742 2,732
Investment securities available-for-sale securities, Gross Unrealized Gains 19 14
Investment securities available-for-sale securities, Gross Unrealized Losses 5 19
Investment securities available-for-sale, Fair Value 2,756 2,727
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 9,533 9,493
Investment securities available-for-sale securities, Gross Unrealized Gains [1] 36 22
Investment securities available-for-sale securities, Gross Unrealized Losses [1] 113 197
Investment securities available-for-sale, Fair Value [1] $ 9,456 $ 9,318
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.