Segment Information Operating Results for Each Segment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
External Revenues	$ 1,483	$ 665	$ 3,524	$ 1,844
Intersegment Revenue	0	0	0	0
Segment Margin	432	188	1,007	535
Operation and maintenance	129	78	300	220
Gathering and Processing
External Revenues	1,387	603	3,254	1,671
Intersegment Revenue	0	0	0	0
Segment Margin	349	136	784	383
Operation and maintenance	104	63	237	177
Natural Gas Transportation
External Revenues	0	0	0	0
Intersegment Revenue	0	0	0	0
Segment Margin	0	0	0	0
Operation and maintenance	0	0	0	0
NGL Services
External Revenues	0	0	0	0
Intersegment Revenue	0	0	0	0
Segment Margin	0	0	0	0
Operation and maintenance	0	0	0	0
Contract Services
External Revenues	76	58	217	159
Intersegment Revenue	3	4	11	11
Segment Margin	66	52	185	149
Operation and maintenance	21	19	62	53
Natural Resources
External Revenues	18	0	40	0
Intersegment Revenue	0	0	0	0
Segment Margin	18	0	40	0
Operation and maintenance	4	0	9	0
Corporate
External Revenues	2	4	13	14
Intersegment Revenue	0	0	0	0
Segment Margin	2	4	9	14
Operation and maintenance	1	0	2	1
Eliminations
External Revenues	0	0	0	0
Intersegment Revenue	(3)	(4)	(11)	(11)
Segment Margin	(3)	(4)	(11)	(11)
Operation and maintenance	$ (1)	$ (4)	$ (10)	$ (11)