Derivatives and Hedging Instruments - Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative [Line Items]
Interest expense	$ 39	$ 83
(Gain) loss reclassified from AOCI	0	19
Cost of services
Derivative [Line Items]
Cost of revenue	466	417
Foreign exchange contracts | Other income (expense), net
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(6)	(5)
Interest rate contracts | Cost of services | Cash Flow Hedging
Derivative [Line Items]
(Gain) loss reclassified from AOCI	0	(15)
Interest rate contracts | Interest expense | Cash Flow Hedging
Derivative [Line Items]
(Gain) loss reclassified from AOCI	$ 0	$ (4)