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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Mar. 31, 2022
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 29 $ 58
Impaired loans with no related allowance, Interest Income Recognized 1  
Impaired loans with an allowance recorded, Recorded Investment 4 5
Impaired loans with an allowance recorded, Related Allowance   1
Total impaired loans, Recorded Investment 33 63
Total impaired loans, Interest Income Recognized 1  
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 9 19
Impaired loans with no related allowance, Interest Income Recognized 1  
Impaired loans with an allowance recorded, Recorded Investment 1 3
Impaired loans with an allowance recorded, Related Allowance   1
Total impaired loans, Recorded Investment 10 22
Total impaired loans, Interest Income Recognized 1  
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 14 33
Impaired loans with an allowance recorded, Recorded Investment 2 2
Total impaired loans, Recorded Investment 16 35
One-to-Four Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with an allowance recorded, Recorded Investment 1  
Total impaired loans, Recorded Investment 1  
Other Loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 6 6
Total impaired loans, Recorded Investment $ 6 $ 6