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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Details) (USD $) | 7 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Haynesville [Member] | Dec. 31, 2013 Eagle Ford [Member] | Dec. 31, 2013 California [Member] | Dec. 31, 2013 Gulf of Mexico [Member] | Dec. 31, 2013 Oil and Gas Operations Segment [Member] | Feb. 14, 2014 Natural Gas [Member] | Dec. 31, 2013 Natural Gas [Member] | Feb. 14, 2014 Crude Oil [Member] | Dec. 31, 2013 Crude Oil [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member]
Oil and Gas In Process Activities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Costs |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |
Asset Retirement Costs, Liabilities Assumed |  |  |  | 0 | [1] | 0 | [1] |  |  |  |  | 1,028,000,000 | [1] |  |  |  |  |  |
General and Administrative Costs Capitalized |  |  |  |  |  |  |  |  |  |  |  | 67,000,000 |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  |  | $ 69,000,000 |  |  |  |  |  |  |
Average Depletion Depreciation and Amortization Expense Per Unit of Production | 35.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs Not Subject to Amortization to be Transferred, Percentage | 61.00% | 61.00% | 61.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Majority of Costs Not Subject to Amortization to be Transferred, Period |  | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remainder of Costs Not Subject to Amortization to be Transferred, Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years | 10 years
Net Undeveloped Acreage Covered by Expiring Leases, Percentage | 41.00% | 41.00% | 41.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acreage Held by Production, Percentage |  |  |  |  |  |  |  | 90.00% | 70.00% |  |  |  |  |  |  |  |  |  |
Average Sales Prices |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.89 | 3.67 | 97.46 | 96.94 |  |
Total Reserve Volumes Subject to Reference Price Differential Quality Adjustments, Percentage |  |  |  |  |  |  |  |  |  | 40.00% | 25.00% |  |  |  |  |  |  |  |
Fair Value Inputs, Discount Rate |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Sales Prices Used in Reserve Reports |  | 3.64 | 99.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The fair value of AROs assumed in the acquisitions of PXP and MMR ($741 million and $287 million, respectively) were estimated based on projected cash flows, an estimated long-term annual inflation rate of 2.5 percent, and discount rates based on FCX's estimated credit-adjusted, risk-free interest rates ranging from 1.3 percent to 6.3 percent.

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- Definition The average DD&A expense computed on the basis of physical units, with oil and gas converted to a common unit of measure on the basis of their approximate relative energy content. + References No definition available. + Details
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