Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating revenues:
Sales of natural gas, propane, NGLs and condensate	$ 1,442	$ 3,143	$ 2,763
Transportation, processing and other	371	345	271
Gain (Loss) on Derivative Instruments, Net, Pretax	85	154	17
Total operating revenues	1,898	3,642	3,051
Operating costs and expenses:
Purchases of natural gas, propane and NGLs	1,246	2,795	2,426
Operating and maintenance expense	214	216	215
Depreciation and amortization expense	120	110	95
General and administrative expense	85	64	63
Goodwill, Impairment Loss	82	0	0
Other expense (income)	4	3	8
Total operating costs and expenses	1,751	3,188	2,807
Operating Income (Loss)	147	454	244
Interest expense	(92)	(86)	(52)
Earnings from unconsolidated affiliates	173	75	33
Income before income taxes	228	443	225
Income tax expense	5	(6)	(8)
Net income	233	437	217
Net income attributable to noncontrolling interests	(5)	(14)	(17)
Net income attributable to partners	228	423	200
Net income attributable to predecessor operations	0	(6)	(25)
General partner's interest in net income	(124)	(114)	(70)
Net income allocable to limited partners	$ 104	$ 303	$ 105
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax	$ 0.91	$ 2.84	$ 1.34
Weighted Average Limited Partnership Units Outstanding, Basic	114,600	106,600	78,400
Weighted Average Limited Partnership Units Outstanding, Diluted	114,600	106,600
Third Party [Member]
Operating revenues:
Sales of natural gas, propane, NGLs and condensate	$ 484	$ 963	$ 932
Transportation, processing and other	253	239	211
Gain (Loss) on Derivative Instruments, Net, Pretax	52	36	(5)
Operating costs and expenses:
Purchases of natural gas, propane and NGLs	1,139	2,524	2,159
General and administrative expense	11	17	17
Affiliated Entity [Member]
Operating revenues:
Sales of natural gas, propane, NGLs and condensate	958	2,180	1,831
Transportation, processing and other	118	106	60
Gain (Loss) on Derivative Instruments, Net, Pretax	33	118	22
Operating costs and expenses:
Purchases of natural gas, propane and NGLs	107	271	267
General and administrative expense	$ 74	$ 47	$ 46