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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Changes in goodwill  
Balance at beginning of period $ 2,535
Foreign currency translation adjustments (27)
Purchase price accounting adjustments and other (5)
Balance at end of period 2,503
Impairment 0
Transportation
 
Changes in goodwill  
Balance at beginning of period 897
Foreign currency translation adjustments (16)
Purchase price accounting adjustments and other (5)
Balance at end of period 876
Facilities
 
Changes in goodwill  
Balance at beginning of period 1,171
Foreign currency translation adjustments (7)
Balance at end of period 1,164
Supply and Logistics
 
Changes in goodwill  
Balance at beginning of period 467
Foreign currency translation adjustments (4)
Balance at end of period $ 463