CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Accumulated Other Comprehensive Income (Loss)	Limited Partner [Member]
Balance at Dec. 31, 2014	$ 2,889	$ 0	$ 2,889
Other comprehensive income, net of tax	2	2	0
Net income (loss)	105	0	105
Distribution to partners	(125)	0	(125)
Unit-based compensation expense	2	0	2
Panhandle Merger	(38)	0	38
Contribution to SUG Holding	(28)	0	28
Balance at Dec. 31, 2015	2,883	2	2,881
Other comprehensive income, net of tax	3	3	0
Net income (loss)	(646)	0	(646)
Distribution to partners	(781)	0	(781)
Unit-based compensation expense	2	0	2
Balance at Dec. 31, 2016	1,461	5	1,456
Other comprehensive income, net of tax	(8)	(8)	0
Non-Cash Equity Contribution	8	0	8
Net income (loss)	(45)	0	(45)
Distribution to partners	(74)	0	(74)
Unit-based compensation expense	3	0	3
Balance at Dec. 31, 2017	$ 1,345	$ (3)	$ 1,348