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Acquisitions Hoover PPA (Details) (Hoover Energy [Member], USD $)
In Millions, unless otherwise specified
Feb. 03, 2014
Accounts receivable, net $ 5
Intangible assets 148
Goodwill (1) 30
Total Assets Acquired 298
Accounts payable and accrued liabilities 5
Asset retirement obligation 2
Total Liabilities Assumed 7
Net Assets Acquired 291
Gathering and Transmission Systems [Member]
 
Property, Plant, and Equipment 72
PP&E Compression Equipment [Member]
 
Property, Plant, and Equipment 15
Other property, plant and equipment [Member]
 
Property, Plant, and Equipment 22
Construction in Progress [Member]
 
Property, Plant, and Equipment $ 6