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Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale, at fair value $ 1,851   $ 1,182
LGG loans $ 386    
Payment performance period threshold 6 months    
Loans 90 days or greater past due and still accruing $ 0   0
Residential mortgage loans in process of foreclosure 57   $ 81
Term Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans modified that subsequently defaulted 8    
Combination - Interest Rate Reduction & Term Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans modified that subsequently defaulted 1    
One-to-four family first mortgage | Term Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans modified that subsequently defaulted   $ 3  
One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans modified that subsequently defaulted   $ 5  
Loans and Leases Held for Investment: | One-to-four family first mortgage | Term Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans modified that subsequently defaulted 0    
Loans and Leases Held for Investment: | One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans modified that subsequently defaulted $ 1