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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, 2020
Sep. 30, 2021
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 23 $ 25
Impaired loans with no related allowance, Interest Income Recognized 1  
Impaired loans with an allowance recorded, Recorded Investment 15 3
Impaired loans with an allowance recorded, Related Allowance 1  
Total impaired loans, Recorded Investment 38 28
Total impaired loans, Interest Income Recognized 1  
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment   7
Impaired loans with an allowance recorded, Recorded Investment 4 1
Impaired loans with an allowance recorded, Related Allowance 1  
Total impaired loans, Recorded Investment 4 8
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 2 11
Impaired loans with an allowance recorded, Recorded Investment 10 2
Total impaired loans, Recorded Investment 12 13
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  
Total impaired loans, Recorded Investment 2  
Other Loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 20 7
Impaired loans with no related allowance, Interest Income Recognized 1  
Total impaired loans, Recorded Investment 20 $ 7
Total impaired loans, Interest Income Recognized $ 1