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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, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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 | $ 3,503 | $ 3,686 |  |
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 | $ 975 | $ 1,032 | $ 1,169 | $ 1,113
Weighted-average life (years) | 3 years 9 months 18 days | 3 years 10 months 24 days |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 8 | $ 9 |  |
Decline in fair value from 20% adverse change in prepayment rate | 15 | 17 |  |
Decline in fair value from 10% adverse change in interest rate | 30 | 31 |  |
Decline in fair value from 20% adverse change in interest rate | 61 | 61 |  |
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 | $ 2,528 | $ 2,654 | $ 2,837 | $ 2,310
Weighted-average life (years) | 7 years 9 months 18 days | 8 years 1 month 6 days |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 61 | $ 60 |  |
Decline in fair value from 20% adverse change in prepayment rate | $ 119 | $ 117 |  |
Weighted-average option adjusted spread | 7.55% | 7.65% |  |
Decline in fair value from 10% adverse change in adjusted spread | $ 78 | $ 83 |  |
Decline in fair value from 20% adverse change in adjusted spread | $ 151 | $ 161 |  |
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 | 0.0441 | 0.0551 |  |
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 | 0.0721 | 0.0642 |  |
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 | 0.1069 | 0.0964 |  |

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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 + Details
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