CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Trunkline LNG Transaction [Member]	Panhandle Merger [Member]	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Trunkline LNG Transaction [Member]	Accumulated Other Comprehensive Income (Loss) Panhandle Merger [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] Trunkline LNG Transaction [Member]	Noncontrolling Interest [Member] Panhandle Merger [Member]	Limited Partner [Member]	Limited Partner [Member] Trunkline LNG Transaction [Member]	Limited Partner [Member] Panhandle Merger [Member]
Balance at Dec. 31, 2012	$ 4,028			$ (9)			$ (13)			$ 4,050
Dividends paid to Southern Union stockholders	(313)			0			(313)			0
Other comprehensive income, net of tax	11			12			(1)			0
SUGS Contribution	(135)			0			(135)			0
Net income (loss)	(535)			0			(36)			(499)
Lake Charles LNG Transaction	12			0			12			0
Balance at Dec. 31, 2013	3,068			3			(486)			3,551
Other comprehensive income, net of tax	(2)			(2)			0			0
Net income (loss)	(3)			0			6			(9)
Distribution to partners	(102)			0			0			(102)
Unit-based compensation expense	1			0			0			1
Panhandle Merger	6	$ (43)	$ 0	0	$ 0	$ (1)	0	$ (23)	$ 503	6	$ (20)	$ (502)
Balance at Dec. 31, 2014	2,925			0			0			2,925
Other comprehensive income, net of tax	2			2			0			0
Net income (loss)	125			0			0			125
Distribution to partners	(125)			0			0			(125)
Unit-based compensation expense	2			0			0			2
Panhandle Merger	38			0			0			38
Contribution to SUG Holding	28			0			0			28
Balance at Dec. 31, 2015	$ 2,939			$ 2			$ 0			$ 2,937