Business Acquisition, Percentage of Interests Acquired

No definition available.

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- Definition

Royalty Rate Lower Limit

+ References

No definition available.

+ Details

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- Definition

Royalty Rate Upper Limit

+ References

No definition available.

+ Details

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- Definition

Variable Interest Entity Consolidated Carrying Amount Cash And Cash Equivalents

+ References

No definition available.

+ Details

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- Definition

Variable Interest Entity Consolidated Carrying Amount Current Liabilities

+ References

No definition available.

+ Details

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- Definition

Variable Interest Entity Consolidated Carrying Amount Long Term Derivative Assets

+ References

No definition available.

+ Details

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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Balance Type:	debit
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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 27

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A3

-Appendix A

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5710-111685

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

+ Details

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Variable Interest Entities Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Jun. 01, 2010
Variable Interest Entity [Line Items]
Consolidation Net Oil and Gas Property Assets	$ 379
Consolidated Current Liabilities	23
Consolidated Cash and Cash Equivalents	1
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	6
Consolidated Long-Term Liabilities	3
Business Acquisition, Cost of Acquired Entity, Purchase Price			313
Noncontrolling interests	2,314	2,327
Mineral Acquisition Company I, L.P.
Variable Interest Entity [Line Items]
Percentage of acquisition	10.00%
Percentage of royalty minimum	7.00%
Percentage of royalty maximum	22.50%
Mineral Acquisition Company I, L.P. \| Limited Partnership
Variable Interest Entity [Line Items]
Percentage of acquisition	90.00%
Mineral Acquisition Company I, L.P. \| Maximum
Variable Interest Entity [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	25
Mineral Acquisition Company I, L.P. \| Maximum \| Limited Partnership
Variable Interest Entity [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 225