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Goodwill and Intangible Assets - Components (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Goodwill, gross | $ 14,653 | $ 14,653 |  |
Goodwill | 14,653 | 14,653 | $ 14,544 | $ 14,533
Intangible assets, gross (excluding Goodwill) | 396 | 2,178 |  |
Accumulated amortization | (306) | (2,004) |  |
Intangible assets, net (excluding Goodwill) | $ 90 | $ 174 |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 7 years 1 month 6 days | 5 years 7 months 6 days |  |
Intangible assets gross including Goodwill | $ 15,049 | $ 16,831 |  |
Total goodwill and other intangible assets, net carrying value | 14,743 | 14,827 |  |
Commercial MSRs, gross | 542 | 555 |  |
Commercial MSR, accumulated amortization | (175) | (255) |  |
Total commercial MSRs | 367 | 300 |  |
Amortization expense for amortizable intangible assets | 69 | 70 |  |
PCCR intangibles |  |  |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Intangible assets, gross (excluding Goodwill) | 148 | 1,932 |  |
Accumulated amortization | (138) | (1,864) |  |
Intangible assets, net (excluding Goodwill) | $ 10 | $ 68 |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 6 years 2 months 12 days | 3 years 10 months 24 days |  |
Other intangible assets |  |  |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Intangible assets, gross (excluding Goodwill) | $ 248 | $ 246 |  |
Accumulated amortization | (168) | (140) |  |
Intangible assets, net (excluding Goodwill) | $ 80 | $ 106 |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 7 years 3 months 18 days | 6 years 8 months 12 days |  |

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