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Segment Information - Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Segment information    
Total assets $ 5,998 $ 5,728
North America    
Segment information    
Total assets 3,939 3,737
South America    
Segment information    
Total assets 723 711
Asia-Pacific    
Segment information    
Total assets 844 792
EMEA    
Segment information    
Total assets $ 492 $ 488