Subsequent Events	6 Months Ended
Jun. 30, 2012
Subsequent Event [Abstract]
Subsequent Events [Text Block]	Subsequent Event On August 1, 2012, Enogex entered into agreements with Chesapeake Midstream Gas Services, L.L.C. and Mid-America Midstream Gas Services, L.L.C., wholly-owned subsidiaries of Access Midstream Partners, L.P. and Chesapeake Midstream Development, L.P., respectively, pursuant to which Enogex agreed to acquire approximately 235 miles of natural gas gathering pipelines, right-of-ways and certain other midstream assets that provide natural gas gathering services in the greater Granite Wash area for an aggregate purchase price of approximately $70 million which is expected to be paid in cash. The purchase price is subject to certain adjustments, including Enogex's obligation to reimburse the sellers for certain permitted capital expenditures incurred during the period beginning June 1, 2012 and ending upon the consummation of the transactions contemplated by these agreements. The consummation of the transactions contemplated by the agreements is subject to customary conditions to closing, including the expiration or early termination of the waiting period under the Hart-Scott-Rodino Act. In connection with these agreements, Enogex will enter into a gas gathering and processing agreement with Chesapeake pursuant to which Enogex will provide fee-based natural gas gathering, compression, processing and transportation services to Chesapeake with respect to certain acreage dedicated by Chesapeake. Including the purchase price of the assets discussed above, Enogex projects additional capital expenditures for the construction of gathering and compression assets associated with these agreements to be approximately $325 million through the remainder of 2012 and 2013. Effectiveness of the gas gathering and processing agreement is contingent on the closing of the agreements discussed above.

Subsequent Event

On August 1, 2012, Enogex entered into agreements with Chesapeake Midstream Gas Services, L.L.C. and Mid-America Midstream Gas Services, L.L.C., wholly-owned subsidiaries of Access Midstream Partners, L.P. and Chesapeake Midstream Development, L.P., respectively, pursuant to which Enogex agreed to acquire approximately 235 miles of natural gas gathering pipelines, right-of-ways and certain other midstream assets that provide natural gas gathering services in the greater Granite Wash area for an aggregate purchase price of approximately $70 million which is expected to be paid in cash. The purchase price is subject to certain adjustments, including Enogex's obligation to reimburse the sellers for certain permitted capital expenditures incurred during the period beginning June 1, 2012 and ending upon the consummation of the transactions contemplated by these agreements. The consummation of the transactions contemplated by the agreements is subject to customary conditions to closing, including the expiration or early termination of the waiting period under the Hart-Scott-Rodino Act.

In connection with these agreements, Enogex will enter into a gas gathering and processing agreement with Chesapeake pursuant to which Enogex will provide fee-based natural gas gathering, compression, processing and transportation services to Chesapeake with respect to certain acreage dedicated by Chesapeake. Including the purchase price of the assets discussed above, Enogex projects additional capital expenditures for the construction of gathering and compression assets associated with these agreements to be approximately $325 million through the remainder of 2012 and 2013. Effectiveness of the gas gathering and processing agreement is contingent on the closing of the agreements discussed above.