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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Changes in goodwill  
Balance at beginning of period $ 2,503
Foreign currency translation adjustments (18)
Balance at end of period 2,485
Transportation
 
Changes in goodwill  
Balance at beginning of period 878
Foreign currency translation adjustments (11)
Balance at end of period 867
Facilities
 
Changes in goodwill  
Balance at beginning of period 1,162
Foreign currency translation adjustments (5)
Balance at end of period 1,157
Supply and Logistics
 
Changes in goodwill  
Balance at beginning of period 463
Foreign currency translation adjustments (2)
Balance at end of period $ 461