Share-Based Compensation Expense - Schedule of Share-Based Compensation Costs Related to RSUs and PRSUs (Details) - RSUs and PRSUs[Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 37	$ 33
Cost of services [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	9	7
Selling, general and administrative expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 28	$ 26