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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 2 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for sale, at fair value |  | $ 7,845 |  | $ 1,182
LGG loans |  | 486 |  |
Loans 90 days or greater past due and still accruing |  | 0 |  | 0
Residential mortgage loans in process of foreclosure |  | 59 |  | $ 81
One-to-four family first mortgage | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified that subsequently defaulted |  | 1 | $ 3 |
One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified that subsequently defaulted |  | 2 | $ 3 |
Loans and Leases Held for Investment: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for sale, at fair value |  | $ 6,400 |  |
Loans and Leases Held for Investment: | Forecast |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, sale | $ 6,000 |  |  |

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