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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, 2022 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 125 | $ 29
Impaired loans with no related allowance, Interest Income Recognized | 1 | 1
Impaired loans with an allowance recorded, Recorded Investment | 16 | 4
Impaired loans with an allowance recorded, Related Allowance | 14 |
Total impaired loans, Recorded Investment | 141 | 33
Total impaired loans, Related Allowance | 14 |
Total impaired loans, Interest Income Recognized | 1 | 1
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 13 | 9
Impaired loans with no related allowance, Interest Income Recognized |  | 1
Impaired loans with an allowance recorded, Recorded Investment |  | 1
Total impaired loans, Recorded Investment | 13 | 10
Total impaired loans, Interest Income Recognized |  | 1
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 19 | 14
Impaired loans with no related allowance, Interest Income Recognized | 1 |
Impaired loans with an allowance recorded, Recorded Investment | 1 | 2
Total impaired loans, Recorded Investment | 20 | 16
Total impaired loans, Interest Income Recognized | 1 |
One-to-Four Family First Mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 90 |
Impaired loans with an allowance recorded, Recorded Investment | 2 | 1
Total impaired loans, Recorded Investment | 92 | 1
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 3 | 6
Impaired loans with an allowance recorded, Recorded Investment | 13 |
Impaired loans with an allowance recorded, Related Allowance | 14 |
Total impaired loans, Recorded Investment | 16 | $ 6
Total impaired loans, Related Allowance | $ 14 |

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