Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	May 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total capitalized interest		$ (116)	$ (121)	$ (151)
Goodwill and Intangible Asset Impairment [Abstract]
Goodwill Impairment Indicated at Year End		$ 0
Common Stock Split [Abstract]
Two-for-One Stock Split	2
Minimum
Property, Plant and Equipment [Line Items]
Useful lives of gathering facilitates and processing plants (in years)		3 years
Useful lives of other property (in years)		3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful lives of gathering facilitates and processing plants (in years)		30 years
Useful lives of other property (in years)		30 years