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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investment securities available-for-sale, Amortized Cost $ 12,633 $ 12,313
Investment securities available-for-sale securities, Gross Unrealized Gains 408 113
Investment securities available-for-sale securities, Gross Unrealized Losses 0 28
Investment securities available-for-sale, Fair Value 13,041 12,398
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 2,746 2,745
Investment securities available-for-sale securities, Gross Unrealized Gains 118 47
Investment securities available-for-sale securities, Gross Unrealized Losses 0 0
Investment securities available-for-sale, Fair Value 2,864 2,792
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 9,887 9,568
Investment securities available-for-sale securities, Gross Unrealized Gains [1] 290 66
Investment securities available-for-sale securities, Gross Unrealized Losses [1] 0 28
Investment securities available-for-sale, Fair Value [1] $ 10,177 $ 9,606
[1]
Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.