Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	7 Months Ended	12 Months Ended			19 Months Ended	7 Months Ended	12 Months Ended			5 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 years	Dec. 31, 2011	Dec. 31, 2010 Successor	Dec. 31, 2012 Successor	Dec. 31, 2011 Successor	Dec. 31, 2009 Successor	May 25, 2010 Predecessor	Dec. 31, 2012 Minimum Gathering and Transmission Systems	Dec. 31, 2012 Minimum Compression Equipment	Dec. 31, 2012 Minimum Gas Plants and Buildings	Dec. 31, 2012 Minimum Other property, plant and equipment	Dec. 31, 2012 Minimum Successor	Dec. 31, 2013 Maximum	Dec. 31, 2012 Maximum Gathering and Transmission Systems	Dec. 31, 2012 Maximum Compression Equipment	Dec. 31, 2012 Maximum Gas Plants and Buildings	Dec. 31, 2012 Maximum Other property, plant and equipment	Dec. 31, 2012 Maximum Successor
Property, Plant and Equipment
Property, Plant and Equipment, Useful Life											10 years 0 months 0 days	2 years 0 months 0 days	5 years 0 months 0 days	3 years 0 months 0 days			20 years 0 months 0 days	30 years 0 months 0 days	35 years 0 months 0 days	15 years 0 months 0 days
Accounting Policies [Abstract]
Inventory			$ 27,000,000	$ 21,000,000	$ 21,000,000
Accrued interest payable			30,000,000	27,000,000	27,000,000
Partnership capitalized interest						1,000,000		1,000,000	1,000,000	1,000,000
Maximum asset retirement obligation period, in years				95
Depreciation expense						138,000,000		168,000,000	60,000,000	37,000,000
Depreciation out of period adjustment	3,000,000			4,000,000	7,000,000
Intangible assets useful life, minimum															20 years 0 months 0 days						30 years 0 months 0 days
Contributions by employer						3,000,000		3,000,000	2,000,000	0
Deferred tax liabilities related to property, plant, and equipment			5,000,000	6,000,000	6,000,000
Current federal tax expense (benefit)	1,000,000						0	0		0
Deferred federal income tax expense (benefit)			(1,000,000)			0		0		0
Effective income tax rate				35.00%
Profit Sharing Plan Employer Percentage Contribution		3.00%
Compensation																$ 125,000