Derivatives - Schedule of Gains (Losses) Related to Derivatives and Related Hedged Items in Fair Value Hedge Relationships (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Foreign currency forwards
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	$ 5	$ (235)	$ 45	$ (350)
Hedged items	(6)	228	(42)	332
Net	(1)	(7)	3	(18)
Foreign currency forwards \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	9	9	16	19
Recognized in income through changes in fair value	0	0	0	0
Foreign currency swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	68	(681)	241	(1,013)
Hedged items	(80)	699	(254)	1,058
Net	(12)	18	(13)	45
Foreign currency swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	0	0	0	0
Recognized in income through changes in fair value	0	0	0	0
Foreign currency interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	(9)	344	(68)	481
Hedged items	21	(330)	79	(464)
Net	12	14	11	17
Foreign currency interest rate swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	0	0	0	0
Recognized in income through changes in fair value	0	0	0	0
Interest rate swaps and forwards and other swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	(192)	65	(299)	194
Hedged items	194	(49)	300	(174)
Net	2	16	1	20
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	0	0
Recognized in income through changes in fair value	0	0	0	0
Foreign currency interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives	21	25	45	48
Hedged items	(21)	(24)	(44)	(47)
Net	0	1	1	1
Foreign currency interest rate swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Recognized in income through amortization approach	0	0	0	0
Recognized in income through changes in fair value	$ 0	$ 0	$ 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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