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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, 2024 | Dec. 31, 2023
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance - Recorded Investment | $ 1,677 | $ 294
Non-accrual loans with no related allowance - Interest Income Recognized | 57 | 7
Non-accrual loans with an allowance recorded - Recorded Investment | 1,026 | 134
Total Non - accrual loans - Related Allowance | 163 | 47
Non-accrual loans with an allowance recorded - Interest Income Recognized | 34 | 3
Total non-accrual loans - Recorded Investment | 2,703 | 428
Total non-accrual loans - Interest Income Recognized | 91 | 10
Mortgage Loans Held for Investment | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance - Recorded Investment | 837 | 134
Non-accrual loans with no related allowance - Interest Income Recognized | 23 | 5
Non-accrual loans with an allowance recorded - Recorded Investment | 667 | 4
Total Non - accrual loans - Related Allowance | 56 | 0
Non-accrual loans with an allowance recorded - Interest Income Recognized | 22 | 0
Total non-accrual loans - Recorded Investment | 1,504 | 138
Total non-accrual loans - Interest Income Recognized | 45 | 5
Mortgage Loans Held for Investment | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance - Recorded Investment | 722 | 53
Non-accrual loans with no related allowance - Interest Income Recognized | 33 | 2
Non-accrual loans with an allowance recorded - Recorded Investment | 83 | 75
Total Non - accrual loans - Related Allowance | 24 | 17
Non-accrual loans with an allowance recorded - Interest Income Recognized | 4 | 3
Total non-accrual loans - Recorded Investment | 805 | 128
Total non-accrual loans - Interest Income Recognized | 37 | 5
Mortgage Loans Held for Investment | One-to-four family first mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance - Recorded Investment | 94 | 85
Non-accrual loans with no related allowance - Interest Income Recognized | 0 | 0
Non-accrual loans with an allowance recorded - Recorded Investment | 9 | 11
Total Non - accrual loans - Related Allowance | 1 | 2
Non-accrual loans with an allowance recorded - Interest Income Recognized | 0 | 0
Total non-accrual loans - Recorded Investment | 103 | 96
Total non-accrual loans - Interest Income Recognized | 0 | 0
Mortgage Loans Held for Investment | Acquisition, development, and construction |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance - Recorded Investment | 17 |
Non-accrual loans with no related allowance - Interest Income Recognized | 1 |
Non-accrual loans with an allowance recorded - Recorded Investment | 17 |
Total Non - accrual loans - Related Allowance | 4 |
Non-accrual loans with an allowance recorded - Interest Income Recognized | 1 |
Total non-accrual loans - Recorded Investment | 34 |
Total non-accrual loans - Interest Income Recognized | 2 |
Other (includes commercial and industrial) |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance - Recorded Investment | 7 | 22
Non-accrual loans with no related allowance - Interest Income Recognized | 0 | 0
Non-accrual loans with an allowance recorded - Recorded Investment | 250 | 44
Total Non - accrual loans - Related Allowance | 78 | 28
Non-accrual loans with an allowance recorded - Interest Income Recognized | 7 | 0
Total non-accrual loans - Recorded Investment | 257 | 66
Total non-accrual loans - Interest Income Recognized | $ 7 | $ 0

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