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Investment Securities (Summary Of Investment Securities In Unrealized Loss Positions) (Details)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
security
Less than 12 Months, Fair Value $ 452,000,000 $ 10,000,000
Less than 12 Months, Unrealized Losses 0 0
12 Months or more, Fair Value 13,777,000,000 16,857,000,000
12 Months or more, Unrealized Losses 2,874,000,000 2,672,000,000
Total Fair Value 14,229,000,000 16,867,000,000
Total Unrealized Losses $ 2,874,000,000 $ 2,672,000,000
Debt Securities Count 1,172 1,250
U.S. Treasury securities    
Less than 12 Months, Fair Value $ 438,000,000 $ 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or more, Fair Value 25,000,000 1,605,000,000
12 Months or more, Unrealized Losses 1,000,000 76,000,000
Total Fair Value 463,000,000 1,605,000,000
Total Unrealized Losses $ 1,000,000 $ 76,000,000
Debt Securities Count 7 19
Residential mortgage-backed securities    
Less than 12 Months, Fair Value $ 0 $ 10,000,000
Less than 12 Months, Unrealized Losses 0 0
12 Months or more, Fair Value 9,074,000,000 10,507,000,000
12 Months or more, Unrealized Losses 2,304,000,000 2,088,000,000
Total Fair Value 9,074,000,000 10,517,000,000
Total Unrealized Losses $ 2,304,000,000 $ 2,088,000,000
Debt Securities Count 913 978
Commercial Mortgage Backed Securities    
Less than 12 Months, Fair Value $ 14,000,000 $ 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or more, Fair Value 4,678,000,000 4,745,000,000
12 Months or more, Unrealized Losses 569,000,000 508,000,000
Total Fair Value 4,692,000,000 4,745,000,000
Total Unrealized Losses $ 569,000,000 $ 508,000,000
Debt Securities Count 252 253