Share-Based Compensation - Schedule of Share-Based Compensation Costs Related to RSUs and PRSUs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 12	$ 62	$ 109
RSUs and PRSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	19	76	139
RSUs and PRSUs | Cost of services, exclusive of depreciation and amortization
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	7	14	30
RSUs and PRSUs | Selling, general and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 12	$ 62	$ 109