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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loans Held For Sale | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | $ 474 | $ 654
Aggregate Unpaid Principal Balance - Assets | 478 | 687
Difference - Assets | (4) | (33)
Loans Held For Sale | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 238 | 276
Aggregate Unpaid Principal Balance - Assets | 228 | 300
Difference - Assets | 10 | (24)
Loans Held For Sale | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 432 | 609
Aggregate Unpaid Principal Balance - Assets | 429 | 633
Difference - Assets | 3 | (24)
Loans Held For Sale | Accruing loans less than 90 days past due | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 238 | 261
Aggregate Unpaid Principal Balance - Assets | 228 | 256
Difference - Assets | 10 | 5
Loans Held For Sale | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 6 | 5
Aggregate Unpaid Principal Balance - Assets | 6 | 5
Difference - Assets |  |
Loans Held For Sale | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 36 | 40
Aggregate Unpaid Principal Balance - Assets | 43 | 49
Difference - Assets | (7) | (9)
Loans Held For Sale | Nonaccrual loans | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets |  | 15
Aggregate Unpaid Principal Balance - Assets |  | 44
Difference - Assets |  | (29)
Loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 1,238 | 1,310
Aggregate Unpaid Principal Balance - Assets | 1,469 | 1,568
Difference - Assets | (231) | (258)
Loans | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 507 | 509
Aggregate Unpaid Principal Balance - Assets | 520 | 521
Difference - Assets | (13) | (12)
Loans | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 146 | 155
Aggregate Unpaid Principal Balance - Assets | 156 | 167
Difference - Assets | (10) | (12)
Loans | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 585 | 646
Aggregate Unpaid Principal Balance - Assets | 793 | 880
Difference - Assets | (208) | (234)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 85 | 80
Aggregate Unpaid Principal Balance - Assets | 69 | 80
Difference - Assets | 16 |
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 39 | 31
Aggregate Unpaid Principal Balance - Liabilities | 40 | 32
Difference - Liabilities | (1) | (1)
Other liabilities |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 124 | 196
Aggregate Unpaid Principal Balance - Liabilities |  |
Difference - Liabilities | $ 124 | $ 196

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