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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Investment securities available-for-sale, Amortized Cost $ 17,116 $ 14,752
Investment securities available-for-sale, Gross Unrealized Gains 91 279
Investment securities available-for-sale, Gross Unrealized Losses 221 3
Investment securities available-for-sale, Fair Value 16,986 15,028
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 3,010 4,583
Investment securities available-for-sale, Gross Unrealized Gains 22 76
Investment securities available-for-sale, Gross Unrealized Losses 39 1
Investment securities available-for-sale, Fair Value 2,993 4,658
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 13,397 10,169
Investment securities available-for-sale, Gross Unrealized Gains [1] 67 203
Investment securities available-for-sale, Gross Unrealized Losses [1] 176 2
Investment securities available-for-sale, Fair Value [1] 13,288 $ 10,370
Commercial Mortgage Backed Securities    
Investment securities available-for-sale, Amortized Cost [1] 709  
Investment securities available-for-sale, Gross Unrealized Gains [1] 2  
Investment securities available-for-sale, Gross Unrealized Losses [1] 6  
Investment securities available-for-sale, Fair Value [1] $ 705  
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.