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General Information (Unaudited) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) $ / bbl | Mar. 31, 2015 USD ($) | 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

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- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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