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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
LGG loans | $ 563 | $ 563 |  |
LGG loans, repurchase liability | 362 | 362 |  |
LGG loans, repossessed assets | 12 | 12 |  |
Loans held for sale, at fair value | 1,926 | 1,926 |  | $ 1,115
Loans reclassified to held-for-sale |  | 360 |  |
Loans 90 days or greater past due and still accruing | 0 | 0 |  | 0
Residential mortgage loans in process of foreclosure | 92 | 92 |  | $ 121
Loans modified | 188 | 253 | $ 45 |
Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified | 12 | 22 |  |
Combination - Interest Rate Reduction & Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified | 5 | 8 |  |
One-to-four family first mortgage | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified that subsequently defaulted |  | 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 |  | 5 |  |
Mortgage Loans: | One-to-four family first mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified | 6 | 12 |  |
Mortgage Loans: | One-to-four family first mortgage | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified | 1 | 4 |  |
Mortgage Loans: | One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified | $ 2 | $ 5 |  |

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