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Allowance for Credit Losses on Loans and Leases - Schedule of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | $ 222 | $ 125
Nonaccrual loans with no related allowance - Interest Income Recognized | 2 | 1
Nonaccrual loans with an allowance recorded - Recorded Investment | 212 | 16
Total nonaccrual loans - Related Allowance | 38 | 14
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 4 | 0
Total nonaccrual loans - Recorded Investment | 434 | 141
Total nonaccrual loans - Interest Income Recognized | 6 | 1
Mortgage | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 58 | 13
Nonaccrual loans with no related allowance - Interest Income Recognized | 1 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 44 |
Total nonaccrual loans - Related Allowance | 1 | 0
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 1 |
Total nonaccrual loans - Recorded Investment | 102 | 13
Total nonaccrual loans - Interest Income Recognized | 2 | 0
Mortgage | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 42 | 19
Nonaccrual loans with no related allowance - Interest Income Recognized | 1 | 1
Nonaccrual loans with an allowance recorded - Recorded Investment | 115 | 1
Total nonaccrual loans - Related Allowance | 4 | 0
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 3 | 0
Total nonaccrual loans - Recorded Investment | 157 | 20
Total nonaccrual loans - Interest Income Recognized | 4 | 1
Mortgage | One-to-four family first mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 84 | 90
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 6 | 2
Total nonaccrual loans - Related Allowance | 0 | 0
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total nonaccrual loans - Recorded Investment | 90 | 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 | 1 |
Total nonaccrual loans - Related Allowance | 1 |
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 |
Total nonaccrual loans - Recorded Investment | 1 |
Total nonaccrual loans - Interest Income Recognized | 0 |
Other (includes C&I) |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 38 | 3
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 46 | 13
Total nonaccrual loans - Related Allowance | 32 | 14
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total nonaccrual loans - Recorded Investment | 84 | 16
Total nonaccrual loans - Interest Income Recognized | $ 0 | $ 0

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