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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total $ 35 $ 47
Current Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 25 44
Loans 30-89 Days Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 2 0
90+ Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 8 3
Mortgage Loans: | Multi-family    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 8  
Mortgage Loans: | Multi-family | Current Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 8  
Mortgage Loans: | Multi-family | Loans 30-89 Days Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 0  
Mortgage Loans: | Multi-family | 90+ Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 0  
Mortgage Loans: | Commercial real estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 2  
Mortgage Loans: | Commercial real estate | Current Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 2  
Mortgage Loans: | Commercial real estate | Loans 30-89 Days Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 0  
Mortgage Loans: | Commercial real estate | 90+ Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 0  
Mortgage Loans: | One-to-four family first mortgage    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 10 3
Mortgage Loans: | One-to-four family first mortgage | Current Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 2 0
Mortgage Loans: | One-to-four family first mortgage | Loans 30-89 Days Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 0 0
Mortgage Loans: | One-to-four family first mortgage | 90+ Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 8 3
Other Loans: | Commercial and industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 14 44
Other Loans: | Commercial and industrial | Current Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 12 44
Other Loans: | Commercial and industrial | Loans 30-89 Days Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 2 0
Other Loans: | Commercial and industrial | 90+ Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 0 $ 0
Other Loans: | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 1  
Other Loans: | Other | Current Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 1  
Other Loans: | Other | Loans 30-89 Days Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total 0  
Other Loans: | Other | 90+ Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Total $ 0