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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

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