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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Less than 12 months, Fair Value $ 16,067 $ 8,008
Less than 12 Months, Unrealized Losses 1,361 140
12 months or more, Fair Value 4,201 2,462
12 Months or more, Unrealized Losses 597 81
Total, Fair Value 20,268 10,470
Total, Unrealized Losses 1,958 221
U.S. Treasury and other U.S. government agency securities    
Less than 12 months, Fair Value 1,098 465
Less than 12 Months, Unrealized Losses 5 6
12 months or more, Fair Value 1,704 1,334
12 Months or more, Unrealized Losses 118 33
Total, Fair Value 2,802 1,799
Total, Unrealized Losses 123 39
Residential Mortgage Backed Securities    
Less than 12 months, Fair Value [1] 10,475 7,197
Less than 12 Months, Unrealized Losses [1] 1,124 128
12 months or more, Fair Value [1] 2,497 1,128
12 Months or more, Unrealized Losses [1] 479 48
Total, Fair Value [1] 12,972 8,325
Total, Unrealized Losses [1] 1,603 176
Commercial Mortgage Backed Securities    
Less than 12 months, Fair Value [1] 4,494 346
Less than 12 Months, Unrealized Losses [1] 232 6
12 months or more, Fair Value [1] 0 0
12 Months or more, Unrealized Losses [1] 0 0
Total, Fair Value [1] 4,494 346
Total, Unrealized Losses [1] $ 232 $ 6
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.