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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
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 | $ 3,467 | $ 3,711 |  |
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 | $ 1,010 | $ 1,085 | $ 1,082 | $ 1,032
Weighted-average life (years) | 3 years 9 months 18 days | 3 years 9 months 18 days |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 8 | $ 8 |  |
Decline in fair value from 20% adverse change in prepayment rate | 16 | 16 |  |
Decline in fair value from 10% adverse change in interest rate | 31 | 35 |  |
Decline in fair value from 20% adverse change in interest rate | 63 | 69 |  |
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 | $ 2,457 | $ 2,626 | $ 2,657 | $ 2,654
Weighted-average life (years) | 7 years 9 months 18 days | 8 years |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 57 | $ 57 |  |
Decline in fair value from 20% adverse change in prepayment rate | $ 111 | $ 111 |  |
Weighted-average option adjusted spread | 7.54% | 7.55% |  |
Decline in fair value from 10% adverse change in adjusted spread | $ 77 | $ 81 |  |
Decline in fair value from 20% adverse change in adjusted spread | $ 150 | $ 157 |  |
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 | 0.0452 | 0.0445 |  |
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 | 0.0674 | 0.0639 |  |
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 | 0.1077 | 0.1118 |  |

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