Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 210

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Segment Information - Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total Revenues	$ 2,760us-gaap_Revenues	$ 5,046us-gaap_Revenues
Income (Loss) Before Income Taxes	(5,092)	746
Total Assets	34,373us-gaap_Assets		40,751us-gaap_Assets
Oil And Gas Exploration And Production [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,085	1,766
Marketing, Gathering And Compression [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,675	3,015
Oilfield Services [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	239
Other Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	26
Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Total Revenues	2,760	5,046
Intersubsegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	0
Operating Segments [Member] \| Reportable Subsegments [Member] \| Oil And Gas Exploration And Production [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,062	1,766
Income (Loss) Before Income Taxes	(5,349)	687
Total Assets	29,102		35,381
Operating Segments [Member] \| Reportable Subsegments [Member] \| Marketing, Gathering And Compression [Member]
Segment Reporting Information [Line Items]
Total Revenues	2,908	5,423
Income (Loss) Before Income Taxes	4	105
Total Assets	1,602		1,978
Operating Segments [Member] \| Reportable Subsegments [Member] \| Oilfield Services [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	510
Income (Loss) Before Income Taxes	0	(42)
Total Assets	0		0
Operating Segments [Member] \| Reportable Subsegments [Member] \| Other Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	26
Income (Loss) Before Income Taxes	(14)	60
Total Assets	4,278		4,283
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	0
Intersegment Eliminations [Member] \| Oil And Gas Exploration And Production [Member]
Segment Reporting Information [Line Items]
Total Revenues	23	0
Intersegment Eliminations [Member] \| Marketing, Gathering And Compression [Member]
Segment Reporting Information [Line Items]
Total Revenues	(1,233)	(2,408)
Intersegment Eliminations [Member] \| Oilfield Services [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	(271)
Intersegment Eliminations [Member] \| Other Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	0
Intersegment Eliminations [Member] \| Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Total Revenues	(1,210)	(2,679)
Income (Loss) Before Income Taxes	267	(64)
Total Assets	(609)		(891)
Intersegment Eliminations [Member] \| Intersubsegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenues	$ 1,210	$ 2,679