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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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 | $ 1,067 | $ 1,644 |  |
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] |  |  |  |
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 | $ 490 | $ 649 | $ 630 | $ 726
Weighted-average life (years) | 4 years 4 months | 4 years 1 month |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 8 | $ 9 |  |
Decline in fair value from 20% adverse change in prepayment rate | 16 | 17 |  |
Decline in fair value from 10% adverse change in interest rate | 13 | 17 |  |
Decline in fair value from 20% adverse change in interest rate | 26 | 34 |  |
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] |  |  |  |
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 | $ 577 | $ 995 | $ 997 | $ 1,257
Weighted-average life (years) | 2 years 11 months | 5 years 2 months |  |
Decline in fair value from 10% adverse change in prepayment rate | $ 41 | $ 46 |  |
Decline in fair value from 20% adverse change in prepayment rate | $ 79 | $ 89 |  |
Spread over the benchmark curve | 9.12% | 7.69% |  |
Decline in fair value from 10% adverse change in adjusted spread | $ 14 | $ 27 |  |
Decline in fair value from 20% adverse change in adjusted spread | $ 27 | $ 52 |  |
Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member] | Commercial Mortgage [Member] |  |  |  |
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 | 0.0484 | 0.0456 |  |
Mortgage Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member] | Residential Mortgage [Member] |  |  |  |
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 | 0.2756 | 0.1351 |  |
Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member] | Commercial Mortgage [Member] |  |  |  |
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 | 0.0742 | 0.0791 |  |

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