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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 38	$ 42	$ 75	$ 75
Cost of services [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	9	10	18	17
Selling, general and administrative expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 29	$ 32	$ 57	$ 58