Derivative Instruments and Hedging Activities - Effect of Fair Value Hedge Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Periodic interest accruals and receipts/payments	$ 36	$ 55	$ 2
Income (expense) from periodic interest accruals and receipts (payments)	(57)
Interest rate swaps \| Interest Revenue
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives designated as hedging instruments	(235)	206	85
Interest rate swaps \| Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives designated as hedging instruments	20	(7)	0
Debt and Hedged Available-for-Sale Securities \| Interest Revenue
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged items	235	(207)	(85)
Long-term debt \| Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged items	$ (18)	$ 7	$ 0

Interest Expense, Fair Value Hedge Derivative Instrument, Increase (Decrease)

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- Definition

Interest Income, Fair Value Hedge Derivative Instrument, Increase (Decrease)

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- Definition

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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