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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Investment securities available-for-sale, Amortized Cost $ 15,745 $ 14,752
Investment securities available-for-sale, Gross Unrealized Gains 200 279
Investment securities available-for-sale, Gross Unrealized Losses 108 3
Investment securities available-for-sale, Fair Value 15,837 15,028
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 3,821 4,583
Investment securities available-for-sale, Gross Unrealized Gains 44 76
Investment securities available-for-sale, Gross Unrealized Losses 21 1
Investment securities available-for-sale, Fair Value 3,844 4,658
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 11,924 10,169
Investment securities available-for-sale, Gross Unrealized Gains [1] 156 203
Investment securities available-for-sale, Gross Unrealized Losses [1] 87 2
Investment securities available-for-sale, Fair Value [1] $ 11,993 $ 10,370
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.