Investments In and Advances To Affiliates (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Apr. 11, 2014 Global Infrastructure Partners [Member]	Jun. 30, 2014 Minority Owned Affiliates [Member]	Jun. 30, 2013 Minority Owned Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Revenue						$ 568	$ 624
Operating margin	819	901	1,613	1,650		150	150
Net income	275	333	341	532		107	13
Acquisitions - net of cash acquired			(728)	(3)
Proceeds from Interests in Affiliate			$ 890	$ 135	$ 730