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Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Loan Modifications, Narrative (Details) - Consumer, excluding credit card - Residential real estate - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable, Modified [Line Items]            
FDMs $ 43,000,000     $ 110,000,000    
Weighted-average term loan extensions 22 years     19 years    
Weighted average contractual interest rate 4.63% 7.22%   4.24%   7.04%
Additional commitments to lend to borrowers whose loans have been modified as FDM's $ 0     $ 0    
Loans subject to a trial modification 27,000,000     59,000,000    
Chapter 7 loans 3,000,000     7,000,000    
Carrying value of new TDRs     $ 80,000,000   $ 313,000,000  
30 or more days past due            
Financing Receivable, Modified [Line Items]            
FDMs $ 6,000,000     $ 20,000,000