Table - I/S Data for Each Segment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
External Revenue	$ 1,427	$ 1,483	$ 1,178	$ 863	$ 677	$ 665	$ 639	$ 540	$ 4,951	$ 2,521	$ 2,000
Intersegment Revenue									0	0	0
Cost of Sales									3,452	1,793	1,387
Total segment margin									1,499	728	613
Operation and maintenance									448	296	228
Depreciation and Amortization									541	287	252
Share of earnings of unconsolidated affiliates’ net income (loss)									195	135	105
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									1,088	1,034	560
Gathering And Processing
External Revenue									4,570	2,287	1,797
Intersegment Revenue									0	0	0
Cost of Sales									3,381	1,767	1,373
Total segment margin									1,189	520	423
Operation and maintenance									360	237	183
Depreciation and Amortization									385	186	159
Share of earnings of unconsolidated affiliates’ net income (loss)									5	1	(10)
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									700	721	395
Natural Gas Transportation
External Revenue									0	1	1
Intersegment Revenue									0	0	0
Cost of Sales									0	0	(1)
Total segment margin									0	1	2
Operation and maintenance									0	0	0
Depreciation and Amortization									0	0	0
Share of earnings of unconsolidated affiliates’ net income (loss)									72	70	71
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 earnings of unconsolidated affiliates’ net income (loss)									116	64	44
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									0	0	0
Contract Services
External Revenue									307	215	183
Intersegment Revenue									14	15	21
Cost of Sales									67	26	15
Total segment margin									254	204	189
Operation and maintenance									86	72	66
Depreciation and Amortization									134	98	86
Share of earnings of unconsolidated affiliates’ net income (loss)									0	0	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									371	311	164
Natural Resources [Member]
External Revenue									58	0	0
Intersegment Revenue									0	0	0
Cost of Sales									0	0	0
Total segment margin									58	0	0
Operation and maintenance									12	0	0
Depreciation and Amortization									14	0	0
Share of earnings of unconsolidated affiliates’ net income (loss)									2	0	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									0	0	0
Corporate
External Revenue									16	18	19
Intersegment Revenue									0	0	0
Cost of Sales									4	0	0
Total segment margin									12	18	20
Operation and maintenance									3	1	0
Depreciation and Amortization									8	3	7
Share of earnings of unconsolidated affiliates’ net income (loss)									0	0	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									17	2	1
Eliminations
External Revenue									0	0	0
Intersegment Revenue									(14)	(15)	(21)
Cost of Sales									0	0	0
Total segment margin									(14)	(15)	(21)
Operation and maintenance									(13)	(14)	(21)
Depreciation and Amortization									0	0	0
Share of earnings of unconsolidated affiliates’ net income (loss)									0	0	0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									$ 0	$ 0	$ 0