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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details)
Mar. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 99,000,000 $ 452,000,000
Less than 12 Months, Unrealized Losses 0 0
12 months or more, Fair Value 13,823,000,000 13,777,000,000
12 Months or more, Unrealized Losses 2,544,000,000 2,874,000,000
Total, Fair Value 13,922,000,000 14,229,000,000
Total, Unrealized Losses $ 2,544,000,000 $ 2,874,000,000
Securities with no credit impairment in unrealized loss position 1,148 1,172
U.S. Treasury securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value $ 98,000,000 $ 438,000,000
Less than 12 Months, Unrealized Losses 0 0
12 months or more, Fair Value 24,000,000 25,000,000
12 Months or more, Unrealized Losses 0 1,000,000
Total, Fair Value 122,000,000 463,000,000
Total, Unrealized Losses $ 0 $ 1,000,000
Securities with no credit impairment in unrealized loss position | security 3 7
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value [1] $ 1,000,000 $ 0
Less than 12 Months, Unrealized Losses [1] 0 0
12 months or more, Fair Value [1] 9,020,000,000 9,074,000,000
12 Months or more, Unrealized Losses [1] 2,087,000,000 2,304,000,000
Total, Fair Value [1] 9,021,000,000 9,074,000,000
Total, Unrealized Losses [1] $ 2,087,000,000 $ 2,304,000,000
Securities with no credit impairment in unrealized loss position | security [1] 896 913
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Less than 12 months, Fair Value [1] $ 0 $ 14,000,000
Less than 12 Months, Unrealized Losses [1] 0 0
12 months or more, Fair Value [1] 4,779,000,000 4,678,000,000
12 Months or more, Unrealized Losses [1] 457,000,000 569,000,000
Total, Fair Value [1] 4,779,000,000 4,692,000,000
Total, Unrealized Losses [1] $ 457,000,000 $ 569,000,000
Securities with no credit impairment in unrealized loss position | security [1] 249 252
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.