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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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 | $ 1,680 | $ 1,242 |  |
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 | $ 701 | $ 569 | $ 477 | $ 649
Weighted-average life (years) | 4 years 8 months 12 days | 4 years 4 months 24 days |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 11 | $ 9 |  |
Decline in fair value from 20% adverse change in prepayment rate | 22 | 18 |  |
Decline in fair value from 10% adverse change in interest rate | 20 | 15 |  |
Decline in fair value from 20% adverse change in interest rate | 40 | 31 |  |
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 | $ 979 | $ 673 | $ 605 | $ 995
Weighted-average life (years) | 6 years 2 months 12 days | 3 years 9 months 18 days |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 38 | $ 41 |  |
Decline in fair value from 20% adverse change in prepayment rate | $ 79 | $ 82 |  |
Spread over the benchmark curve | 9.44% | 9.22% |  |
Decline in fair value from 10% adverse change in adjusted spread | $ 34 | $ 20 |  |
Decline in fair value from 20% adverse change in adjusted spread | $ 66 | $ 38 |  |
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 | 0.0487 | 0.0487 |  |
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 | 0.1072 | 0.2113 |  |
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 | 0.0739 | 0.0733 |  |

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