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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
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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 |  |

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