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Allowance for Credit Losses on Loans and Leases - Schedule of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | $ 656 | $ 294
Nonaccrual loans with no related allowance - Interest Income Recognized | 3 | 7
Nonaccrual loans with an allowance recorded - Recorded Investment | 142 | 134
Total nonaccrual loans - Related Allowance | 48 | 47
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 3
Total nonaccrual loans - Recorded Investment | 798 | 428
Total nonaccrual loans - Interest Income Recognized | 3 | 10
Mortgage | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 334 | 134
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 | 5
Nonaccrual loans with an allowance recorded - Recorded Investment | 5 | 4
Total nonaccrual loans - Related Allowance | 1 | 0
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total nonaccrual loans - Recorded Investment | 339 | 138
Total nonaccrual loans - Interest Income Recognized | 0 | 5
Mortgage | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 188 | 53
Nonaccrual loans with no related allowance - Interest Income Recognized | 3 | 2
Nonaccrual loans with an allowance recorded - Recorded Investment | 76 | 75
Total nonaccrual loans - Related Allowance | 17 | 17
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 3
Total nonaccrual loans - Recorded Investment | 264 | 128
Total nonaccrual loans - Interest Income Recognized | 3 | 5
Mortgage | One-to-four family first mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 89 | 85
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 9 | 11
Total nonaccrual loans - Related Allowance | 0 | 2
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total nonaccrual loans - Recorded Investment | 98 | 96
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 | 3 |
Total nonaccrual loans - Related Allowance | 2 |
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 |
Total nonaccrual loans - Recorded Investment | 3 |
Total nonaccrual loans - Interest Income Recognized | 0 |
Other (includes C&I) |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with no related allowance - Recorded Investment | 45 | 22
Nonaccrual loans with no related allowance - Interest Income Recognized | 0 | 0
Nonaccrual loans with an allowance recorded - Recorded Investment | 49 | 44
Total nonaccrual loans - Related Allowance | 28 | 28
Nonaccrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total nonaccrual loans - Recorded Investment | 94 | 66
Total nonaccrual loans - Interest Income Recognized | $ 0 | $ 0

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