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Acquisitions and Divestitures (5) Goldsmith Landreth Field Unit (Details) - Legado Resources [Member] - Goldsmith-Landreth Field Unit [Member]
$ in Millions
Jun. 01, 2013
USD ($)
MMcf
May. 31, 2013
USD ($)
a
Business Acquisition [Line Items]    
Business Combination, Consideration Transferred $ 298  
Payments to Acquire Businesses, Gross $ 280  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   $ 18
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Long-Term Asset Retirement Obligations   $ 12
Maximum [Member]    
Business Acquisition [Line Items]    
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume Per Day | MMcf 150  
Ector County, Texas [Member]    
Business Acquisition [Line Items]    
Area of Land | a   6,000