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Business Combinations - PCD Loans Acquired (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 20, 2023 | Dec. 01, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |
ACL at acquisition |  |  | $ (13) | $ (51)
Signature Bridge Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Par value (UPB) | $ 583 |  |  |
ACL at acquisition | (13) |  |  |
Non-credit (discount) | (76) |  |  |
Fair value | $ 494 |  |  |
Flagstar Bancorp |  |  |  |
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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- Definition Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-19 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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