Derivative Financial Instruments - Amounts Related to Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Income recognized from securities with terminated hedges	$ 9	$ 9	$ 17	$ 18
Fair Value Hedges \| Interest Rate Contracts \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet
Derivative Instruments, Gain (Loss) [Line Items]
Net interest income	(11)	27	(24)	41
Fair Value Hedges \| Interest Rate Contracts \| Location, Statement of Financial Position, Activity, Capitalization [Axis]: us-gaap:FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet
Derivative Instruments, Gain (Loss) [Line Items]
Amounts related to settlements	14	79	29	158
Recognized on derivatives	171	(199)	292	(591)
Recognized on hedged items	(171)	201	(292)	594
Net interest income	14	81	29	161
Fair Value Hedges \| Interest Rate Contracts \| Location, Statement of Financial Position, Activity, Capitalization [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet
Derivative Instruments, Gain (Loss) [Line Items]
Amounts related to settlements	(1)	0	(1)	(1)
Fair Value Hedges \| Interest Rate Contracts \| Location, Statement of Financial Position, Activity, Capitalization [Axis]: us-gaap:LongTermDebt \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet
Derivative Instruments, Gain (Loss) [Line Items]
Amounts related to settlements	(24)	(56)	(51)	(120)
Recognized on derivatives	(262)	92	(435)	244
Recognized on hedged items	262	(90)	434	(243)
Net interest income	$ (24)	$ (54)	$ (52)	$ (119)

Income recognized from securities with terminated hedges

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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.

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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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Amount of gain (loss) on derivative instrument designated and qualifying as fair value hedge included in assessment of hedge effectiveness, recognized in earnings.

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- Definition

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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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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