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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 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 | $ 3,293 | $ 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 | $ 1,061 | $ 1,113 | $ 886 | $ 740
Weighted-average life (years) | 3 years 10 months 24 days | 4 years |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 8 | $ 8 |  |
Decline in fair value from 20% adverse change in prepayment rate | 14 | 15 |  |
Decline in fair value from 10% adverse change in interest rate | 31 | 34 |  |
Decline in fair value from 20% adverse change in interest rate | 63 | 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 | $ 2,232 | $ 2,310 | $ 1,322 | $ 1,078
Weighted-average life (years) | 7 years 8 months 12 days | 8 years |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 57 | $ 55 |  |
Decline in fair value from 20% adverse change in prepayment rate | $ 111 | $ 107 |  |
Spread over the benchmark curve | 7.68% | 7.66% |  |
Decline in fair value from 10% adverse change in adjusted spread | $ 66 | $ 69 |  |
Decline in fair value from 20% adverse change in adjusted spread | $ 129 | $ 134 |  |
Mortgage Servicing Rights | Measurement Input, 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 | 0.0439 | 0.0428 |  |
Mortgage Servicing Rights | Measurement Input, 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 | 0.0722 | 0.0672 |  |
Mortgage Servicing Rights | Measurement Input, 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 | 0.0954 | 0.0977 |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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