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v3.25.0.1

Debt Securities (Narrative) (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) security | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available for sale | $ 26,224,000,000 |  | $ 26,224,000,000 | $ 28,104,000,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 1,722 |  | 1,722 | 1,703
Debt Securities, Available-for-Sale, Realized Loss |  |  | $ 222,000,000 |
Debt Securities, Available-for-sale, Realized Gain |  |  | 14,000,000 |
Gross Realized Gain (Loss), net |  |  | 208,000,000 |
Debt Securities Transferred from Available for Sale to Held to Maturity, Amortized Cost | $ 2,000,000,000.0 | $ 2,500,000,000 | 2,000,000,000.0 |
OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityUnrealizedGainLossBeforeAdjustmentBeforeTax | 318,000,000 | $ 436,000,000 |  |
Asset Pledged as Collateral |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available for sale | $ 20,900,000,000 |  | $ 20,900,000,000 | $ 24,000,000,000.0

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