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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loans Held For Sale | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | $ 654 | $ 1,302
Aggregate Unpaid Principal Balance - Assets | 687 | 1,282
Difference - Assets | (33) | 20
Loans Held For Sale | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 276 | 575
Aggregate Unpaid Principal Balance - Assets | 300 | 580
Difference - Assets | (24) | (5)
Loans Held For Sale | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 609 | 1,249
Aggregate Unpaid Principal Balance - Assets | 633 | 1,219
Difference - Assets | (24) | 30
Loans Held For Sale | Accruing loans less than 90 days past due | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 261 | 575
Aggregate Unpaid Principal Balance - Assets | 256 | 580
Difference - Assets | 5 | (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 | 5 | 6
Aggregate Unpaid Principal Balance - Assets | 5 | 6
Difference - Assets |  |
Loans Held For Sale | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 40 | 47
Aggregate Unpaid Principal Balance - Assets | 49 | 57
Difference - Assets | (9) | (10)
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 | 1,310 | 1,501
Aggregate Unpaid Principal Balance - Assets | 1,568 | 1,804
Difference - Assets | (258) | (303)
Loans | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 509 | 487
Aggregate Unpaid Principal Balance - Assets | 521 | 498
Difference - Assets | (12) | (11)
Loans | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 155 | 262
Aggregate Unpaid Principal Balance - Assets | 167 | 278
Difference - Assets | (12) | (16)
Loans | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 646 | 752
Aggregate Unpaid Principal Balance - Assets | 880 | 1,028
Difference - Assets | (234) | (276)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 80 | 105
Aggregate Unpaid Principal Balance - Assets | 80 | 107
Difference - Assets |  | (2)
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 31 | 30
Aggregate Unpaid Principal Balance - Liabilities | 32 | 30
Difference - Liabilities | (1) |
Other liabilities |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 196 |
Aggregate Unpaid Principal Balance - Liabilities |  |
Difference - Liabilities | $ 196 |

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