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Business Combination - Summary of Loans and Leases Purchased as Part of Acquisition (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 01, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
ACL at acquisition | $ 393 |  | $ 199 | $ 194
Mortgage |  |  |  |
Business Acquisition [Line Items] |  |  |  |
ACL at acquisition | 290 |  | 178 | 176
Other |  |  |  |
Business Acquisition [Line Items] |  |  |  |
ACL at acquisition | $ 103 |  | $ 21 | $ 18
Flagstar |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Par value (UPB) |  | $ 1,950 |  |
ACL at acquisition |  | (51) |  |
Non-credit (discount) |  | (33) |  |
Fair value |  | $ 1,866 |  |

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