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Derivative Financial Instruments - OCI Derivative Changes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Foreign Exchange Contract
Derivative [Line Items]
Amount of (loss)/gain recognized in OCI/L	$ (2)	$ 1	$ (14)	$ 31
Foreign Exchange Contract \| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfRevenue
Derivative [Line Items]
Amount of loss/(gain) reclassified from OCI/L into Revenue/Cost of revenue	(1)	(2)	(5)	(4)
Foreign Exchange Contract \| Location, Statement of Income, Balance [Axis]: us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
Derivative [Line Items]
Amount of loss/(gain) reclassified from OCI/L into Revenue/Cost of revenue	3	(3)	1	2
Cross Currency Swaps
Derivative [Line Items]
Amount of (loss)/gain recognized in OCI/L	(42)	14	43	(341)
Amount of income recognized in Interest expense	$ 15
Cross Currency Swaps \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestExpenseNonoperating
Derivative [Line Items]
Amount of income recognized in Interest expense		$ 11	$ 43	$ 31