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General Information (Unaudited) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2016 | Mar. 31, 2016 USD ($) $ / bbl | Mar. 31, 2015 USD ($) | Jun. 30, 2016 | Dec. 31, 2015 $ / bbl
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |
Fair Value Inputs, Discount Rate |  | 10.00% |  |  |
Accumulated Costs Related to Unproved Properties Transferred to Full Cost Pool |  | $ 3,100 |  |  |
Impairment of oil and gas properties |  | $ (3,787) | $ (3,104) |  |
Crude Oil [Member] |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |
Average Sales Prices | $ / bbl |  | 46.26 |  |  | 50.28
Subsequent Event [Member] | Morenci [Member] |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |
Disposal Date |  |  |  | Feb. 15, 2016 |
Subsequent Event [Member] | Oil and Gas Royalty Interests [Member] |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |
Disposal Date | Apr. 21, 2016 |  |  |  |
Subsequent Event [Member] | Serbia [Member] |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |
Disposal Date |  |  |  | May 02, 2016 |

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