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 |