Summary of Significant Accounting Policies (Details) $ in Millions		12 Months Ended
	Apr. 22, 2013	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Property, Plant and Equipment [Line Items]
Total capitalized interest		$ (144)	$ 116	$ 121
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