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, 2026	Mar. 31, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expense	$ 4	$ 6
Cost of services, exclusive of depreciation and amortization
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expense	2	3
Selling, general and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total share-based compensation expense	$ 2	$ 3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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