Variable Interest Entities Narrative (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Variable Interest Entity [Line Items]
Other Commitment	$ 59
Chesapeake Granite Wash Trust \| Consolidated Entities
Variable Interest Entity [Line Items]
Consolidation Net Oil and Gas Property Assets	352
Consolidated Current Liabilities	21
Consolidated Cash and Cash Equivalents	1
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	4
Consolidated Long-Term Liabilities	1
Mineral Acquisition Company I, L.P. \| Corporate Ownership Requirement [Member]
Variable Interest Entity [Line Items]
Percentage of acquisition	10.00%
Mineral Acquisition Company I, L.P. \| Corporate Ownership Requirement [Member] \| Minimum
Variable Interest Entity [Line Items]
Percentage of royalty minimum	7.00%
Mineral Acquisition Company I, L.P. \| Corporate Ownership Requirement [Member] \| Maximum
Variable Interest Entity [Line Items]
Other Commitment	25
Percentage of royalty maximum	22.50%
Mineral Acquisition Company I, L.P. \| Partner Ownership Requirement [Member] \| Limited Partner [Member]
Variable Interest Entity [Line Items]
Percentage of acquisition	90.00%
Mineral Acquisition Company I, L.P. \| Partner Ownership Requirement [Member] \| Maximum \| Limited Partner [Member]
Variable Interest Entity [Line Items]
Other Commitment	$ 225

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

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ 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=28200181&loc=d3e5710-111685

+ Details

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- 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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- Details

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