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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Investment securities available-for-sale, Amortized Cost $ 12,281 $ 12,225
Investment securities available-for-sale securities, Gross Unrealized Gains 110 36
Investment securities available-for-sale securities, Gross Unrealized Losses 53 216
Investment securities available-for-sale, Fair Value 12,338 12,045
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 2,744 2,732
Investment securities available-for-sale securities, Gross Unrealized Gains 49 14
Investment securities available-for-sale securities, Gross Unrealized Losses 0 19
Investment securities available-for-sale, Fair Value 2,793 2,727
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 9,537 9,493
Investment securities available-for-sale securities, Gross Unrealized Gains [1] 61 22
Investment securities available-for-sale securities, Gross Unrealized Losses [1] 53 197
Investment securities available-for-sale, Fair Value [1] $ 9,545 $ 9,318
[1]
Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.