Derivatives and Hedging Activities (Details Textual) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Margin on interest rate swap not netted	$ 756	$ 368
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Outstanding balance	Outstanding balance
Carrying values of hedged liabilities	$ 37,000	$ 18,900
Cumulative amount of fair value hedging adjustments	366	27
Increase (decrease) in interest expense on long term debt and other	106	254	$ 189
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	39,000	28,800
Other Expense
Derivatives, Fair Value [Line Items]
Gain (loss) in changes in fair value of derivatives not designated as hedges	121	102	82
Credit Valuation Adjustment
Derivatives, Fair Value [Line Items]
Derivative, amount of hedged item	0	0
Fair Value Hedges \| Fixed-Rate Debt Obligations
Derivatives, Fair Value [Line Items]
Derivative, amount of hedged item	36,700	18,900
Net Investment Hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	16,300	14,300
Gain (loss) on net investment hedges, net of taxes	(1,000)	800	(600)
Reclassifications out of AOCI	0	0	0
Embedded Derivative \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	78	78
Fair value of embedded derivative asset, gross	10	31
Embedded Derivative \| Noninterest Income \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Gain (loss) on embedded derivative	$ (21)	$ 13	$ (9)

Changes in the fair value of the derivatives and the related underlying foreign currency exposure

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Amount posted as initial margin for centrally cleared interest rate swaps which is not netted against the derivative balances.

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Represents the amount of a net reduction to interest expense on long-term debt and other, primarily related to the net settlements on the Company's fair value hedges.

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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Nominal or face amount used to calculate payment on derivative.

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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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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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Amount of liability hedged in fair value hedging relationship.

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Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. Excludes cumulative basis adjustment related to foreign exchange risk.

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Indicates line item in statement of financial position that includes hedged liability.

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Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge.

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