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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 |

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