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.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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General Information (Unaudited) (Details) $ in Millions	3 Months Ended			6 Months Ended
General Information (Unaudited) (Details) $ in Millions	Jun. 30, 2015 USD ($)	Mar. 31, 2015 $ / bbl	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) $ / bbl	Jun. 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	$ (2,686)		$ 0	$ (5,790)	$ 0
Crude Oil [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Average Sales Prices \| $ / bbl		82.72		71.68