Share-Based Compensation - Schedule of Share-Based Compensation Costs Related to RSUs and PRSUs (Details) - RSUs and PRSUs - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 6	$ 28
Cost of services, exclusive of depreciation and amortization
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	3	5
Selling, general and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 3	$ 23