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, 2013	$ 3,068			$ 3			$ (486)			$ 3,551
Other comprehensive income, net of tax	(2)			(2)			0			0
Net income (loss)	(39)			0			6			(45)
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	2,889			0			0			2,889
Other comprehensive income, net of tax	2			2			0			0
Net income (loss)	105			0			0			105
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	2,883			2			0			2,881
Other comprehensive income, net of tax	3			3			0			0
Net income (loss)	(646)			0			0			(646)
Distribution to partners	(781)			0			0			(781)
Unit-based compensation expense	2			0			0			2
Balance at Dec. 31, 2016	$ 1,461			$ 5			$ 0			$ 1,456