Derivatives - Schedule of Gains (Losses) Related to Derivatives and Related Hedged Items in Fair Value Hedge Relationships (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Foreign currency forwards
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	$ 40	$ (115)
Hedged items	(36)	104
Net	4	(11)
Foreign currency forwards \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	7	10
Recognized in income through changes in fair value	0	0
Foreign currency swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	173	(332)
Hedged items	(174)	359
Net	(1)	27
Foreign currency swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	0	0
Recognized in income through changes in fair value	0	0
Foreign currency interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	(59)	137
Hedged items	58	(134)
Net	(1)	3
Foreign currency interest rate swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	0	0
Recognized in income through changes in fair value	0	0
Interest rate swaps and forwards and other swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	(107)	129
Hedged items	106	(125)
Net	(1)	4
Interest rate swaps and forwards and other swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	0	0
Recognized in income through changes in fair value	0	0
Foreign currency interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	24	23
Hedged items	(23)	(23)
Net	1	0
Foreign currency interest rate swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	0	0
Recognized in income through changes in fair value	$ 0	$ 0

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) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

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

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Amount, before tax, of adjustments from accumulated other comprehensive income (AOCI) for gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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