Restructuring Charges	9 Months Ended
	Sep. 30, 2021
Restructuring Charges [Abstract]
Restructuring Charges	During 2020, we incurred costs related to both our realignment program and our 2020 Fit for Growth Plan. Our realignment program, which began in 2017, improved our client focus, cost structure and the efficiency and effectiveness of our delivery while continuing to drive revenue growth. Our 2020 Fit for Growth Plan, which began in the fourth quarter of 2019, simplified our organizational model and optimized our cost structure in order to partially fund the investments required to execute on our strategy and advance our growth agenda and included our decision to exit certain content-related services that were not in line with our strategic vision for the Company. The total costs related to our realignment program and our 2020 Fit for Growth Plan are reported in "Restructuring charges" in our unaudited consolidated statements of operations. During the three months ended September 30, 2020, we incurred $8 million of professional fees related to our realignment program and $43 million of employee separation and facility exit costs and other charges related to our 2020 Fit for Growth Plan. During the nine months ended September 30, 2020, we incurred $40 million of certain employee retention costs and professional fees related to our realignment program and $137 million of employee separation, employee retention and facility exit costs and other charges related to our 2020 Fit for Growth Plan. We did not incur any costs related to these plans during the three and nine months ended September 30, 2021.