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Acquisitions and Divestitures - Divestitures (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($)			12 Months Ended
	Feb. 25, 2014	Feb. 26, 2013	Dec. 31, 2013	Mar. 31, 2015	Dec. 31, 2014
Gulf Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and natural gas properties	$ 702,600,000
Guarantee period for certain plugging and abandonment obligations (up to)	1 year
Contingent liability equal to fair value of guarantees recorded as part of sale	$ 9,400,000				$ 5,100,000
Restricted deposits previously held in escrow, cash received				$ 12,000,000
Loss on sale of oil and gas property	0
Permian Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and natural gas properties		$ 2,600,000,000
Loss on sale of oil and gas property			$ 398,900,000
Permian Properties | Non-controlling Interest
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of oil and gas property			$ 71,700,000
Asset Retirement Obligations | Gulf Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset retirement obligations assumed	$ 366,000,000

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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