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Business Combinations - PCD Loans Acquired (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Mar. 20, 2023 | Sep. 30, 2023 | Sep. 30, 2022
Business Acquisition [Line Items] |  |  |
ACL at acquisition |  | $ (13) | $ 0
Signature Bridge Bank |  |  |
Business Acquisition [Line Items] |  |  |
Par value (UPB) | $ 583 |  |
ACL at acquisition | (13) |  |
Non-credit (discount) | (76) |  |
Fair value | $ 494 |  |

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