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Investment Securities (Summary Of Investment Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Investment securities available-for-sale, Amortized Cost $ 14,758 $ 12,313
Investment securities available-for-sale securities, Gross Unrealized Gains 334 113
Investment securities available-for-sale securities, Gross Unrealized Losses 2 28
Investment securities available-for-sale, Fair Value 15,090 12,398
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 4,590 2,745
Investment securities available-for-sale securities, Gross Unrealized Gains 93 47
Investment securities available-for-sale securities, Gross Unrealized Losses 0 0
Investment securities available-for-sale, Fair Value 4,683 2,792
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 10,168 9,568
Investment securities available-for-sale securities, Gross Unrealized Gains [1] 241 66
Investment securities available-for-sale securities, Gross Unrealized Losses [1] 2 28
Investment securities available-for-sale, Fair Value [1] $ 10,407 $ 9,606
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.