Goodwill (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Changes in goodwill
Balance at beginning of period	$ 2,503
Foreign currency translation adjustments	(23)
Other	1
Balance at end of period	2,481
Impairment	0
Transportation
Changes in goodwill
Balance at beginning of period	878
Foreign currency translation adjustments	(14)
Balance at end of period	864
Facilities
Changes in goodwill
Balance at beginning of period	1,162
Foreign currency translation adjustments	(6)
Other	1
Balance at end of period	1,157
Supply and Logistics
Changes in goodwill
Balance at beginning of period	463
Foreign currency translation adjustments	(3)
Balance at end of period	$ 460