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General Information (Unaudited) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2015 | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2015 $ / bbl | Sep. 30, 2015 USD ($) $ / bbl | Sep. 30, 2014 USD ($)
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |  |
Fair Value Inputs, Discount Rate |  |  |  |  | 10.00% |
Impairment of oil and gas properties |  | $ (3,652) | $ (308) |  | $ (9,442) | $ (308)
Accumulated Costs Related to Unproved Properties Transferred to Full Cost Pool |  | 837 |  |  |  |
Restructuring Costs and Asset Impairment Charges |  | $ 36 |  |  |  |
Crude Oil [Member] |  |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |  |
Average Sales Prices | $ / bbl |  |  |  | 71.68 | 59.21 |
Tyrone [Member] |  |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |  |
Reduction in Operating Rates, Percent |  | 50.00% |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 59 |  |  |  |
El Abra [Member] |  |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |  |
Reduction in Operating Rates, Percent |  | 50.00% |  |  |  |
Henderson [Member] |  |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |  |
Reduction in Operating Rates, Percent |  | 35.00% |  |  |  |
Subsequent Event [Member] | Sierrita [Member] |  |  |  |  |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |  |  |  |
Reduction in Operating Rates, Percent | 50.00% |  |  |  |  |

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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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