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Fair Value (Fair Value Option - Fair Value and Principal Balances (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Loans Held For Sale | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | $ 628 | $ 474
Aggregate Unpaid Principal Balance - Assets | 635 | 478
Difference - Assets | (7) | (4)
Loans Held For Sale | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 588 | 432
Aggregate Unpaid Principal Balance - Assets | 588 | 429
Difference - Assets |  | 3
Loans Held For Sale | Accruing loans less than 90 days past due | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 203 | 238
Aggregate Unpaid Principal Balance - Assets | 200 | 228
Difference - Assets | 3 | 10
Loans Held For Sale | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 11 | 6
Aggregate Unpaid Principal Balance - Assets | 11 | 6
Difference - Assets |  |
Loans Held For Sale | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 29 | 36
Aggregate Unpaid Principal Balance - Assets | 36 | 43
Difference - Assets | (7) | (7)
Loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 1,156 | 1,238
Aggregate Unpaid Principal Balance - Assets | 1,360 | 1,469
Difference - Assets | (204) | (231)
Loans | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 494 | 507
Aggregate Unpaid Principal Balance - Assets | 505 | 520
Difference - Assets | (11) | (13)
Loans | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 126 | 146
Aggregate Unpaid Principal Balance - Assets | 137 | 156
Difference - Assets | (11) | (10)
Loans | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 536 | 585
Aggregate Unpaid Principal Balance - Assets | 718 | 793
Difference - Assets | (182) | (208)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 133 | 85
Aggregate Unpaid Principal Balance - Assets | 142 | 69
Difference - Assets | (9) | 16
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 34 | 39
Aggregate Unpaid Principal Balance - Liabilities | 35 | 40
Difference - Liabilities | (1) | (1)
Other Liabilities With Contractual Unpaid Principal Balance |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 28 |
Aggregate Unpaid Principal Balance - Liabilities | 32 |
Difference - Liabilities | (4) |
Other Liabilities Without Contractual Unpaid Principal Balance |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 106 | 124
Aggregate Unpaid Principal Balance - Liabilities |  |
Difference - Liabilities | $ 106 | $ 124

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