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Business Combinations - PCD Loans Acquired (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 20, 2023
Mar. 31, 2023
Mar. 31, 2022
Business Acquisition [Line Items]      
ACL at acquisition   $ (13) $ 0
Signature Bridge Bank      
Business Acquisition [Line Items]      
Par value (UPB) $ 633    
ACL at acquisition (13)    
Non-credit (discount) (96)    
Fair value $ 524