CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Stockholders' Equity, Balance	$ 2,917	$ 2,917	$ 3,068
Distribution to partners		(89)
Net income (loss)	16	(19)
Trunkline LNG Transaction [Member]
Stockholders' Equity, Other		(43)
Panhandle Merger [Member]
Stockholders' Equity, Other		0
Limited partner
Stockholders' Equity, Balance	2,915	2,915	3,551
Distribution to partners		(89)
Net income (loss)		(25)
Limited partner | Trunkline LNG Transaction [Member]
Stockholders' Equity, Other		(20)
Limited partner | Panhandle Merger [Member]
Stockholders' Equity, Other		(502)
Noncontrolling Interest [Member]
Stockholders' Equity, Balance	0	0	(486)
Distribution to partners		0
Net income (loss)		6
Noncontrolling Interest [Member] | Trunkline LNG Transaction [Member]
Stockholders' Equity, Other		(23)
Noncontrolling Interest [Member] | Panhandle Merger [Member]
Stockholders' Equity, Other		503
Accumulated Other Comprehensive Loss
Stockholders' Equity, Balance	2	2	3
Distribution to partners		0
Net income (loss)		0
Accumulated Other Comprehensive Loss | Trunkline LNG Transaction [Member]
Stockholders' Equity, Other		0
Accumulated Other Comprehensive Loss | Panhandle Merger [Member]
Stockholders' Equity, Other		$ (1)