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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details)
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 1,000,000 $ 10,000,000
Less than 12 Months, Unrealized Losses 0 0
12 months or more, Fair Value 15,786,000,000 16,857,000,000
12 Months or more, Unrealized Losses 2,253,000,000 2,672,000,000
Total, Fair Value 15,787,000,000 16,867,000,000
Total, Unrealized Losses $ 2,253,000,000 $ 2,672,000,000
Securities with no credit impairment in unrealized loss position 1,194 1,250
U.S. Treasury securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 0 $ 0
Less than 12 Months, Unrealized Losses 0 0
12 months or more, Fair Value 1,086,000,000 1,605,000,000
12 Months or more, Unrealized Losses 28,000,000 76,000,000
Total, Fair Value 1,086,000,000 1,605,000,000
Total, Unrealized Losses $ 28,000,000 $ 76,000,000
Securities with no credit impairment in unrealized loss position | security 13 19
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value [1] $ 1,000,000 $ 10,000,000
Less than 12 Months, Unrealized Losses [1] 0 0
12 months or more, Fair Value [1] 9,822,000,000 10,507,000,000
12 Months or more, Unrealized Losses [1] 1,852,000,000 2,088,000,000
Total, Fair Value [1] 9,823,000,000 10,517,000,000
Total, Unrealized Losses [1] $ 1,852,000,000 $ 2,088,000,000
Securities with no credit impairment in unrealized loss position | security [1] 929 978
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value [1] $ 0 $ 0
Less than 12 Months, Unrealized Losses [1] 0 0
12 months or more, Fair Value [1] 4,878,000,000 4,745,000,000
12 Months or more, Unrealized Losses [1] 373,000,000 508,000,000
Total, Fair Value [1] 4,878,000,000 4,745,000,000
Total, Unrealized Losses [1] $ 373,000,000 $ 508,000,000
Securities with no credit impairment in unrealized loss position | security [1] 252 253
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.