CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,928	$ 3,068
Distribution to partners	(65)
Net income (loss)	(35)
Balance,	2,928	3,554
Trunkline LNG Transaction [Member]
Stockholders' Equity, Other	(40)
Panhandle Merger [Member]
Stockholders' Equity, Other	0
Limited partner
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,926	3,551
Distribution to partners	(65)
Net income (loss)	(41)
Limited partner | Trunkline LNG Transaction [Member]
Stockholders' Equity, Other	(17)
Limited partner | Panhandle Merger [Member]
Stockholders' Equity, Other	(502)
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	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, Including Portion Attributable to Noncontrolling Interest	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)