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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details)
$ in Millions
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 15 $ 8,504
Less than 12 Months, Unrealized Losses 0 771
12 months or more, Fair Value 16,308 10,506
12 Months or more, Unrealized Losses 3,646 2,262
Total, Fair Value 16,323 19,010
Total, Unrealized Losses $ 3,646 $ 3,033
Debt Securities Count | security 1,267 1,289
U.S. Treasury securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 0 $ 996
Less than 12 Months, Unrealized Losses 0 5
12 months or more, Fair Value 1,681 1,668
12 Months or more, Unrealized Losses 107 141
Total, Fair Value 1,681 2,664
Total, Unrealized Losses $ 107 $ 146
Debt Securities Count | security 20 27
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 15 $ 3,500
Less than 12 Months, Unrealized Losses 0 361
12 months or more, Fair Value 10,159 8,153
12 Months or more, Unrealized Losses 2,754 1,967
Total, Fair Value 10,174 11,653
Total, Unrealized Losses $ 2,754 $ 2,328
Debt Securities Count | security 994 1,008
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 0 $ 4,008
Less than 12 Months, Unrealized Losses 0 405
12 months or more, Fair Value 4,468 685
12 Months or more, Unrealized Losses 785 154
Total, Fair Value 4,468 4,693
Total, Unrealized Losses $ 785 $ 559
Debt Securities Count | security 253 254