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Acquisitions (Frazer-Nash Consultancy Limited) (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 20, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Acquisition related costs   $ 12 $ 9 $ 2
Goodwill   2,060 $ 1,761 $ 1,265
Frazer-Nash Consultancy Limited        
Business Acquisition [Line Items]        
Cash consideration paid $ 392      
Acquisition related costs   4    
Revenues   31    
Gross profit   $ 2    
Goodwill $ 292