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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 49 $ 29
Impaired loans with no related allowance, Interest Income Recognized 1 1
Impaired loans with an allowance recorded, Recorded Investment 1 4
Total impaired loans, Recorded Investment 50 33
Total impaired loans, Interest Income Recognized 1 1
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 17 9
Impaired loans with no related allowance, Interest Income Recognized   1
Impaired loans with an allowance recorded, Recorded Investment 1 1
Total impaired loans, Recorded Investment 18 10
Total impaired loans, Interest Income Recognized   1
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 27 14
Impaired loans with no related allowance, Interest Income Recognized 1  
Impaired loans with an allowance recorded, Recorded Investment   2
Total impaired loans, Recorded Investment 27 16
Total impaired loans, Interest Income Recognized 1  
One-to-Four Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with an allowance recorded, Recorded Investment   1
Total impaired loans, Recorded Investment   1
Acquisition, Development, and Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 1  
Total impaired loans, Recorded Investment 1  
Other Loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 4 6
Total impaired loans, Recorded Investment $ 4 $ 6