Contingencies and Commitments (Unaudited) Asset Retirement Obligations (Details) (USD $)
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6 Months Ended | |||
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Jun. 30, 2013
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Asset Retirement Obligations Rollforward [Line Items] | ||||
Balance at December 31, 2012 | $ 1,146,000,000 | |||
Liabilities assumed in the acquisitions of PXP and MMR | 1,024,000,000 | [1] | ||
Liabilities incurred | 9,000,000 | |||
Revisions to cash flow estimates | 15,000,000 | |||
Accretion expense | 33,000,000 | |||
Spending, including oil and gas settlements | (28,000,000) | |||
Balance at June 30, 2013 | 2,199,000,000 | |||
Less current portion | 130,000,000 | |||
Long-term portion | 2,069,000,000 | |||
Fair Value Assumptions, Inflation Rate | 2.50% | |||
Plains Exploration & Production Company [Member]
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Asset Retirement Obligations Rollforward [Line Items] | ||||
Liabilities assumed in the acquisitions of PXP and MMR | 741,000,000 | |||
McMoRan Exploration Co [Member]
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Asset Retirement Obligations Rollforward [Line Items] | ||||
Liabilities assumed in the acquisitions of PXP and MMR | $ 283,000,000 | |||
Minimum [Member]
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Asset Retirement Obligations Rollforward [Line Items] | ||||
Fair Value Assumptions, Risk Free Interest Rate | 1.30% | |||
Maximum [Member]
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Asset Retirement Obligations Rollforward [Line Items] | ||||
Fair Value Assumptions, Risk Free Interest Rate | 6.30% | |||
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