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Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in goodwill        
Balance at beginning of period $ 2,540 $ 2,540 $ 2,521  
Foreign currency translation adjustments     19  
Acquisitions   2    
Goodwill, gross   2,542    
Impairments (2,515) (2,515) 0 $ 0
Foreign currency translation adjustments   (27)    
Accumulated impairment losses   (2,542)    
Balance at end of period   0 2,540 2,521
Operating Segments | Transportation        
Changes in goodwill        
Balance at beginning of period 1,052 1,052 1,040  
Foreign currency translation adjustments     12  
Acquisitions   2    
Goodwill, gross   1,054    
Impairments   (1,038)    
Foreign currency translation adjustments   (16)    
Accumulated impairment losses   (1,054)    
Balance at end of period   0 1,052 1,040
Operating Segments | Facilities        
Changes in goodwill        
Balance at beginning of period 982 982 978  
Foreign currency translation adjustments     4  
Acquisitions   0    
Goodwill, gross   982    
Impairments   (975)    
Foreign currency translation adjustments   (7)    
Accumulated impairment losses   (982)    
Balance at end of period   0 982 978
Operating Segments | Supply and Logistics        
Changes in goodwill        
Balance at beginning of period $ 506 506 503  
Foreign currency translation adjustments     3  
Acquisitions   0    
Goodwill, gross   506    
Impairments   (502)    
Foreign currency translation adjustments   (4)    
Accumulated impairment losses   (506)    
Balance at end of period   $ 0 $ 506 $ 503
Level 3 | Valuation Technique, Discounted Cash Flow        
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Level 3 | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate        
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