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Summary of Significant Accounting Standards and Policies - Goodwill and accumulated impairment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Carrying value of goodwill      
Goodwill before impairment charges     $ 946
Accumulated impairment charges     (155)
Balance at the beginning of the period $ 801 $ 791  
Acquisitions 99 7  
Currency translation 2 3  
Balance at the end of the period 902 801  
North America      
Carrying value of goodwill      
Goodwill before impairment charges     601
Accumulated impairment charges     (1)
Balance at the beginning of the period 607 600  
Acquisitions 14 7  
Balance at the end of the period 621 607  
South America      
Carrying value of goodwill      
Goodwill before impairment charges     55
Accumulated impairment charges     (33)
Balance at the beginning of the period 21 22  
Currency translation (4) (1)  
Balance at the end of the period 17 21  
Asia-Pacific      
Carrying value of goodwill      
Goodwill before impairment charges     225
Accumulated impairment charges     (121)
Balance at the beginning of the period 108 104  
Acquisitions 85    
Currency translation 2 4  
Balance at the end of the period 195 108  
EMEA      
Carrying value of goodwill      
Goodwill before impairment charges     $ 65
Balance at the beginning of the period 65 65  
Currency translation 4    
Balance at the end of the period $ 69 $ 65