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v3.20.4

Goodwill and Mortgage Servicing Rights (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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 | $ 1,242 | $ 1,644 |  |
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 | $ 569 | $ 649 | $ 726 | $ 668
Weighted-average life | 4 years 4 months 24 days | 4 years 1 month 6 days |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 9 | $ 9 |  |
Decline in fair value from 20% adverse change in prepayment rate | 18 | 17 |  |
Decline in fair value from 10% adverse change in interest rate | 15 | 17 |  |
Decline in fair value from 20% adverse change in interest rate | 31 | 34 |  |
Mortgage Servicing Rights | Residential Mortgages |  |  |  |
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 | $ 673 | $ 995 | $ 1,257 | $ 1,164
Weighted-average life | 3 years 9 months 18 days | 5 years 2 months 12 days |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 41 | $ 46 |  |
Decline in fair value from 20% adverse change in prepayment rate | $ 82 | $ 89 |  |
Spread over the benchmark curve | 9.22% | 7.69% |  |
Decline in fair value from 10% adverse change in adjusted spread | $ 20 | $ 27 |  |
Decline in fair value from 20% adverse change in adjusted spread | $ 38 | $ 52 |  |
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 | 0.0456 |  |
Mortgage Servicing Rights | Measurement Input, Constant Prepayment Rate | Residential Mortgages |  |  |  |
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 | 0.2113 | 0.1351 |  |
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 | 0.0733 | 0.0791 |  |

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