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Acquisitions (Scientific Management Associates (Operations) Pty Ltd) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 06, 2020
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]          
Goodwill     $ 2,060 $ 1,761 $ 1,265
SMA          
Business Acquisition [Line Items]          
Purchase price of acquisition $ 13        
Hold-backs to be settled and other adjustments 4        
Cash consideration paid 9        
Goodwill $ 12        
Payment of contingent consideration liability   $ 1