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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
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 29 $ 23
Impaired loans with no related allowance, Interest Income Recognized 1 1
Impaired loans with an allowance recorded, Recorded Investment 4 15
Impaired loans with an allowance recorded, Related Allowance   1
Total impaired loans, Recorded Investment 33 38
Total impaired loans, Interest Income Recognized 1 1
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 9  
Impaired loans with no related allowance, Interest Income Recognized 1  
Impaired loans with an allowance recorded, Recorded Investment 1 4
Impaired loans with an allowance recorded, Related Allowance   1
Total impaired loans, Recorded Investment 10 4
Total impaired loans, Interest Income Recognized 1  
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 14 2
Impaired loans with an allowance recorded, Recorded Investment 2 10
Total impaired loans, Recorded Investment 16 12
One-to-Four Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment   1
Impaired loans with an allowance recorded, Recorded Investment 1 1
Total impaired loans, Recorded Investment 1 2
Acquisition, Development, and Construction    
Financing Receivable, Impaired [Line Items]    
Total impaired loans, Recorded Investment  
Other Loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 6 20
Total impaired loans, Recorded Investment 6 $ 20
Total impaired loans, Interest Income Recognized