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Goodwill (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Changes in goodwill  
Beginning Balance $ 2,521
Foreign currency translation adjustments 8
Ending Balance 2,529
Operating Segments | Transportation  
Changes in goodwill  
Beginning Balance 1,040
Foreign currency translation adjustments 5
Ending Balance 1,045
Operating Segments | Facilities  
Changes in goodwill  
Beginning Balance 978
Foreign currency translation adjustments 2
Ending Balance 980
Operating Segments | Supply and Logistics  
Changes in goodwill  
Beginning Balance 503
Foreign currency translation adjustments 1
Ending Balance $ 504