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Goodwill and Intangible Assets - Components (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Goodwill, gross | $ 14,782 | $ 14,653 |  |
Goodwill | 14,782 | 14,653 | $ 14,653 | $ 14,544
Intangible assets, gross (excluding Goodwill) | 242 | 396 |  |
Accumulated amortization | (131) | (306) |  |
Intangible assets, net (excluding Goodwill) | 111 | 90 |  |
Intangible assets gross including Goodwill | 15,024 | 15,049 |  |
Total goodwill and other intangible assets, net carrying value | 14,893 | 14,743 |  |
Commercial MSRs, gross | 622 | 542 |  |
Commercial MSR, accumulated amortization | (202) | (175) |  |
Total commercial MSRs | $ 420 | $ 367 |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 4 years 4 months 24 days | 7 years 1 month 6 days |  |
Amortization expense for amortizable intangible assets | $ 79 | $ 69 |  |
PCCR intangibles |  |  |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Intangible assets, gross (excluding Goodwill) | 29 | 148 |  |
Accumulated amortization | (10) | (138) |  |
Intangible assets, net (excluding Goodwill) | $ 19 | $ 10 |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 5 years 10 months 24 days | 6 years 2 months 12 days |  |
Other intangible assets |  |  |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Intangible assets, gross (excluding Goodwill) | $ 213 | $ 248 |  |
Accumulated amortization | (121) | (168) |  |
Intangible assets, net (excluding Goodwill) | $ 92 | $ 80 |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 4 years 1 month 6 days | 7 years 3 months 18 days |  |

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