Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 45
-Paragraph 28
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Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section S99
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Business Segment Information - Summarized Financial Information Concerning Segments (Additional Information) (Details) - USD ($)	3 Months Ended					12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Full cost ceiling impairments					$ 164,800,000	$ 4,500,000,000	$ 164,800,000	$ 0
Asset impairment charges	$ 886,800,000	$ 1,100,000,000	$ 1,500,000,000	$ 1,100,000,000		4,534,689,000	192,768,000	26,280,000
Discontinued Operations, Disposed of by Sale \| Permian Properties
Segment Reporting Information [Line Items]
Loss on sale of oil and gas property								398,900,000
Gas Treating Plants and other Midstream Assets
Segment Reporting Information [Line Items]
Asset impairment charges						7,100,000	600,000	12,200,000
Buildings
Segment Reporting Information [Line Items]
Asset impairment charges						15,400,000
Gas Gathering and Processing Equipment [Member]
Segment Reporting Information [Line Items]
Asset impairment charges						700,000
Corporate Asset
Segment Reporting Information [Line Items]
Asset impairment charges								2,900,000
CO2 Compression Facilities
Segment Reporting Information [Line Items]
Asset impairment charges								8,300,000
Exploration and Production
Segment Reporting Information [Line Items]
Full cost ceiling impairments						4,500,000,000	164,800,000
Drilling and Oil Field Services
Segment Reporting Information [Line Items]
Asset impairment charges						37,600,000	27,400,000	11,100,000
Midstream Services \| Gas Treating Plants and other Midstream Assets
Segment Reporting Information [Line Items]
Asset impairment charges						$ 7,100,000	$ 600,000	$ 3,900,000