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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |  |  |
Fair value | $ 4,006 | $ 3,423 |  |
Mortgage Servicing Rights | Commercial real estate |  |  |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |  |  |
Fair value | $ 1,169 | $ 1,113 | $ 1,132 | $ 740
Weighted-average life (years) | 4 years | 4 years |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 9 | $ 8 |  |
Decline in fair value from 20% adverse change in prepayment rate | 18 | 15 |  |
Decline in fair value from 10% adverse change in interest rate | 36 | 34 |  |
Decline in fair value from 20% adverse change in interest rate | 73 | 68 |  |
Mortgage Servicing Rights | Residential mortgage loans held for sale |  |  |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |  |  |
Fair value | $ 2,837 | $ 2,310 | $ 2,074 | $ 1,078
Weighted-average life (years) | 8 years 4 months 24 days | 8 years |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 58 | $ 55 |  |
Decline in fair value from 20% adverse change in prepayment rate | $ 112 | $ 107 |  |
Spread over the benchmark curve | 7.65% | 7.66% |  |
Decline in fair value from 10% adverse change in adjusted spread | $ 89 | $ 69 |  |
Decline in fair value from 20% adverse change in adjusted spread | $ 173 | $ 134 |  |
Mortgage Servicing Rights | Constant prepayment rate | Commercial real estate |  |  |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |  |  |
Servicing asset, measurement input | 0.0542 | 0.0428 |  |
Mortgage Servicing Rights | Constant prepayment rate | Residential mortgage loans held for sale |  |  |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |  |  |
Servicing asset, measurement input | 0.0577 | 0.0672 |  |
Mortgage Servicing Rights | Discount rate | Commercial real estate |  |  |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |  |  |
Servicing asset, measurement input | 0.1022 | 0.0977 |  |

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