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Allowance for Credit Losses on Loans and Leases - Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total non-accrual loans with no related allowance | $ 2,123 | $ 1,636
Total non-accrual loans with an allowance recorded, recorded investment | 1,157 | 979
Total non-accrual loans with an allowance recorded, related allowance | 209 | 164
Total non-accrual loans | 3,280 | 2,615
Mortgage Loans Held for Investment | Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Total non-accrual loans with no related allowance | 1,563 | 1,092
Total non-accrual loans with an allowance recorded, recorded investment | 798 | 663
Total non-accrual loans with an allowance recorded, related allowance | 100 | 77
Total non-accrual loans | 2,361 | 1,755
Mortgage Loans Held for Investment | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Total non-accrual loans with no related allowance | 446 | 429
Total non-accrual loans with an allowance recorded, recorded investment | 143 | 135
Total non-accrual loans with an allowance recorded, related allowance | 35 | 31
Total non-accrual loans | 589 | 564
Mortgage Loans Held for Investment | One-to-four family first mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Total non-accrual loans with no related allowance | 67 | 61
Total non-accrual loans with an allowance recorded, recorded investment | 10 | 9
Total non-accrual loans with an allowance recorded, related allowance | 1 | 1
Total non-accrual loans | 77 | 70
Mortgage Loans Held for Investment | Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total non-accrual loans with an allowance recorded, related allowance |  | 0
Total non-accrual loans |  | 202
Other |  |
Financing Receivable, Impaired [Line Items] |  |
Total non-accrual loans with no related allowance | 1 | 3
Total non-accrual loans with an allowance recorded, recorded investment | 21 | 21
Total non-accrual loans with an allowance recorded, related allowance | 20 | 55
Total non-accrual loans | 22 | 24
Other | Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total non-accrual loans with no related allowance | 46 | 51
Total non-accrual loans with an allowance recorded, recorded investment | 185 | 151
Total non-accrual loans with an allowance recorded, related allowance | 53 |
Total non-accrual loans | $ 231 |

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