Share-Based Compensation - Schedule of Share-Based Compensation Costs Related to RSUs and PRSUs (Details) - RSUs and PRSUs - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 11	$ 29	$ 59	$ 93
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	7	11	21
Selling, general and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Share-based compensation expense	$ 8	$ 22	$ 48	$ 72

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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+ Details