Consolidated Statement of Income (Unaudited) (USD $) In Millions, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Total revenues	$ 1,671	$ 1,400	$ 3,250	$ 2,890
Segment costs and expenses:
Costs and operating expenses	1,163	1,002	2,268	2,035
Selling, general, and administrative expenses	74	70	147	132
Other (income) expense - net	(1)	(6)	(12)	(9)
Segment costs and expenses	1,236	1,066	2,403	2,158
General corporate expenses	27	28	57	63
Operating income:
Total operating income	408	306	790	669
Equity earnings	36	27	61	53
Interest accrued	(107)	(102)	(215)	(183)
Interest capitalized	3	7	5	19
Interest income			1	3
Other (income) expense - net	(2)	2	3	1
Net income	338	240	645	562
Less: Net income attributable to noncontrolling interests		5		11
Net income attributable to controlling interests	338	235	645	551
Allocation of net income for calculation of earnings per common unit:
Net income attributable to controlling interests	338	235	645	551
Allocation of net income to general partner and Class C units	74	65	145	359
Allocation of net income to common units	264	170	500	192
Basic and diluted net income per common unit	$ 0.91	$ 0.66	$ 1.72	$ 1.24
Weighted average number of common units outstanding	290,213,003	255,777,452	290,029,807	154,838,225
Cash distributions per common unit	$ 0.7325	$ 0.6725	$ 1.4500	$ 1.3300
Gas Pipeline [Member]
Revenues:
Total revenues	407	380	823	787
Operating income:
Total operating income	138	138	304	298
Equity earnings	14	10	23	19
Midstream Gas & Liquids [Member]
Revenues:
Total revenues	1,264	1,020	2,427	2,103
Operating income:
Total operating income	297	196	543	434
Equity earnings	22	17	38	34
General corporate expenses [Member]
Operating income:
Total operating income	$ (27)	$ (28)	$ (57)	$ (63)