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Goodwill and Intangible Assets, Net - Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]      
Beginning Balance, Goodwill $ 3,900 $ 3,858 $ 3,921
Foreign currency translation 60 28 (63)
Acquisitions   14  
Ending Balance, Goodwill 4,071 $ 3,900 $ 3,858
U.K. Acquisitions      
Goodwill [Roll Forward]      
Acquisitions 98    
Canada Acquisition      
Goodwill [Roll Forward]      
Acquisitions 10    
Other      
Goodwill [Roll Forward]      
Acquisitions $ 3