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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

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