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Summary of Significant Accounting Standards and Policies - Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Carrying value of goodwill      
Goodwill before impairment charges     $ 958
Accumulated impairment charges     (155)
Balance at the beginning of the period $ 791 $ 803  
Acquisitions 7    
Currency translation 3 12  
Balance at the end of the period 801 791  
North America      
Carrying value of goodwill      
Goodwill before impairment charges     601
Accumulated impairment charges     (1)
Balance at the beginning of the period 600 600  
Acquisitions 7    
Balance at the end of the period 607 600  
South America      
Carrying value of goodwill      
Goodwill before impairment charges     59
Accumulated impairment charges     (33)
Balance at the beginning of the period 22 26  
Currency translation (1) 4  
Balance at the end of the period 21 22  
Asia-Pacific      
Carrying value of goodwill      
Goodwill before impairment charges     228
Accumulated impairment charges     (121)
Balance at the beginning of the period 104 107  
Currency translation 4 3  
Balance at the end of the period 108 104  
EMEA      
Carrying value of goodwill      
Goodwill before impairment charges     $ 70
Balance at the beginning of the period 65 70  
Currency translation   5  
Balance at the end of the period $ 65 $ 65