Segment Information Total Segment Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting Information
Total assets	$ 17,180	$ 8,782
Gathering and Processing
Segment Reporting Information
Total assets	12,310	4,748
Natural Gas Transportation
Segment Reporting Information
Total assets	1,132	991
NGL Services
Segment Reporting Information
Total assets	1,145	1,070
Contract Services
Segment Reporting Information
Total assets	1,977	1,897
Natural Resources
Segment Reporting Information
Total assets	515	0
Corporate and Others
Segment Reporting Information
Total assets	$ 101	$ 76