CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $) In Millions	Total	Predecessor	Predecessor Accumulated Other Comprehensive Income (Loss)	Predecessor Noncontrolling Interest [Member]	Predecessor Limited Partner [Member]	Successor	Successor Trunkline LNG Transaction [Member]	Successor Panhandle Merger [Member]	Successor Accumulated Other Comprehensive Income (Loss)	Successor Accumulated Other Comprehensive Income (Loss) Trunkline LNG Transaction [Member]	Successor Accumulated Other Comprehensive Income (Loss) Panhandle Merger [Member]	Successor Noncontrolling Interest [Member]	Successor Noncontrolling Interest [Member] Trunkline LNG Transaction [Member]	Successor Noncontrolling Interest [Member] Panhandle Merger [Member]	Successor Limited Partner [Member]	Successor Limited Partner [Member] Trunkline LNG Transaction [Member]	Successor Limited Partner [Member] Panhandle Merger [Member]
Balance at Dec. 31, 2011		$ 2,640	$ (16)	$ 847	$ 1,809
Equity-based compensation		2	0	2	0
Restricted stock issuances		(3)	0	(3)	0
Purchase of treasury stock		(1,450)	0	(1,450)	0
Capital contributions		0
Distribution to partners		(19)
Net income (loss)		50	0	10	40
Other comprehensive income, net of tax		12	3	9	0
Balance at Mar. 25, 2012		1,251	(13)	(585)	1,849	3,913			0			(49)			3,962
Dividends paid to Southern Union stockholders						(65)			0			(65)			0
Capital contributions						166			0			166			0
Distribution to partners						(65)
Net income (loss)						39			0			(49)			88
Other comprehensive income, net of tax						(25)			(9)			(16)			0
Balance at Dec. 31, 2012						4,028			(9)			(13)			4,050
Dividends paid to Southern Union stockholders						(313)			0			(313)			0
Capital contributions						0
Distribution to partners						(313)
Sales of MGE and NEG, net of tax						12			0			12			0
SUGS Contribution						(135)			0			(135)			0
Net income (loss)	(535)					(535)			0			(36)			(499)
Other comprehensive income, net of tax						11			12			(1)			0
Balance at Dec. 31, 2013	3,554					3,068			3			(486)			3,551
Equity-based compensation						1			0			0			1
Capital contributions						0
Distribution to partners						(102)			0			0			(102)
Panhandle Merger						6	(43)	0	0	0	(1)	0	(23)	503	6	(20)	(502)
Net income (loss)	(3)					(3)			0			6			(9)
Other comprehensive income, net of tax						(2)			(2)			0			0
Balance at Dec. 31, 2014	$ 2,925					$ 2,925			$ 0			$ 0			$ 2,925