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Allowance for Credit Losses on Loans and Leases - Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance: | $ 2,681 | $ 1,636
Non-accrual loans with an allowance recorded: | 560 | 979
Total non-accrual loans | 3,241 | 2,615
Related Allowance | 168 | 164
Mortgage Loans Held for Investment | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance: | 2,148 | 1,092
Non-accrual loans with an allowance recorded: | 292 | 663
Total non-accrual loans | 2,440 | 1,755
Related Allowance | 47 | 77
Mortgage Loans Held for Investment | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance: | 394 | 429
Non-accrual loans with an allowance recorded: | 157 | 135
Total non-accrual loans | 551 | 564
Related Allowance | 56 | 31
Mortgage Loans Held for Investment | One-to-four family first mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance: | 52 | 61
Non-accrual loans with an allowance recorded: | 18 | 9
Total non-accrual loans | 70 | 70
Related Allowance | 2 | 1
Other |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance: | 0 | 3
Non-accrual loans with an allowance recorded: | 26 | 21
Total non-accrual loans | 26 | 24
Related Allowance | 23 | 55
Other | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Non-accrual loans with no related allowance: | 87 | 51
Non-accrual loans with an allowance recorded: | 67 | 151
Total non-accrual loans | 154 | 202
Related Allowance | $ 40 | $ 0

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