Table - I/S Data for Each Segment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
External Revenue	$ 677	$ 665	$ 639	$ 540	$ 587	$ 527	$ 511	$ 375	$ 2,521	$ 2,000	$ 1,434
Intersegment Revenue									0	0	0
Cost of Sales									1,793	1,387	1,013
Total segment margin									728	613	421
Operation and maintenance									296	228	147
Depreciation and Amortization									287	252	169
Share of net income									135	105	120
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									1,034	560	406
Gathering And Processing
External Revenue									2,287	1,797	1,226
Intersegment Revenue									0	0	0
Cost of Sales									1,767	1,373	993
Total segment margin									521	423	233
Operation and maintenance									237	183	98
Depreciation and Amortization									186	159	87
Share of net income									1	(10)	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									721	395	282
Natural Gas Transportation
External Revenue									1	1	1
Intersegment Revenue									0	0	0
Cost of Sales									0	(1)	(2)
Total segment margin									0	2	3
Operation and maintenance									0	0	0
Depreciation and Amortization									0	0	0
Share of net income									70	71	92
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									0	0	0
NGL Services
External Revenue									0	0	0
Intersegment Revenue									0	0	0
Cost of Sales									0	0	0
Total segment margin									0	0	0
Operation and maintenance									0	0	0
Depreciation and Amortization									0	0	0
Share of net income									64	44	28
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									0	0	0
Contract Services
External Revenue									215	183	190
Intersegment Revenue									15	21	17
Cost of Sales									26	15	22
Total segment margin									204	189	185
Operation and maintenance									72	66	66
Depreciation and Amortization									98	86	78
Share of net income									0	0	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									311	164	120
Corporate
External Revenue									18	19	17
Intersegment Revenue									0	0	0
Cost of Sales									0	0	0
Total segment margin									18	20	17
Operation and maintenance									1	0	0
Depreciation and Amortization									3	7	4
Share of net income									0	0	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									2	1	4
Eliminations
External Revenue									0	0	0
Intersegment Revenue									(15)	(21)	(17)
Cost of Sales									0	0	0
Total segment margin									(15)	(21)	(17)
Operation and maintenance									(14)	(21)	(17)
Depreciation and Amortization									0	0	0
Share of net income									0	0	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									$ 0	$ 0	$ 0