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Allowance for Credit Losses on Loans and Leases - Schedule of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | $ 294 | $ 125
Nonaccrual loans with no related allowance - Interest Income Recognized | 7 | 1
Nonaccrual loans with an allowance recorded - Recorded Investment | 134 | 16
Total nonaccrual loans - Related Allowance | 47 | 14
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 3 | 0
Total nonaccrual loans - Recorded Investment | 428 | 141
Total nonaccrual loans - Interest Income Recognized | 10 | 1
Mortgage | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 134 | 13
Nonaccrual loans with no related allowance - Interest Income Recognized | 5 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 4 |
Total nonaccrual loans - Related Allowance | 0 | 0
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 |
Total nonaccrual loans - Recorded Investment | 138 | 13
Total nonaccrual loans - Interest Income Recognized | 5 | 0
Mortgage | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 53 | 19
Nonaccrual loans with no related allowance - Interest Income Recognized | 2 | 1
Nonaccrual loans with an allowance recorded - Recorded Investment | 75 | 1
Total nonaccrual loans - Related Allowance | 17 | 0
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 3 | 0
Total nonaccrual loans - Recorded Investment | 128 | 20
Total nonaccrual loans - Interest Income Recognized | 5 | 1
Mortgage | One-to-four family first mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 85 | 90
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 11 | 2
Total nonaccrual loans - Related Allowance | 2 | 0
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total nonaccrual loans - Recorded Investment | 96 | 92
Total nonaccrual loans - Interest Income Recognized | 0 | 0
Mortgage | Acquisition, development, and construction |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 0 |
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 |
Nonaccrual loans with an allowance recorded - Recorded Investment | 0 |
Total nonaccrual loans - Related Allowance | 0 |
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 |
Total nonaccrual loans - Recorded Investment | 0 |
Total nonaccrual loans - Interest Income Recognized | 0 |
Other |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 22 | 3
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 44 | 13
Total nonaccrual loans - Related Allowance | 28 | 14
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total nonaccrual loans - Recorded Investment | 66 | 16
Total nonaccrual loans - Interest Income Recognized | $ 0 | $ 0

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