Long Term Purchase Commitment, Time Period, Term

No definition available.

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- Definition

The maximum amount of funding to be provided by the entity for future drilling and completion cost each calendar year.

+ References

No definition available.

+ Details

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- Definition

Average natural gas price agreed upon benchmark for funding of future drilling and completion costs (in MMBtu's). If the average price of gas drops below benchmark for 3 consecutive months, capital carry will to be suspended until the average price of gas rises above the benchmark for a 3 consecutive month period.

+ References

No definition available.

+ Details

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- Definition

Remaining obligation of joint venture's future drilling and completion costs

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount of daily production of the applicable energy source.

+ References

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

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 8

-Subparagraph A

+ Details

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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Balance Type:	debit
Period Type:	duration

- Details

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- Details

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- Details

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Commitments and Contingencies (Details) (USD $)	3 Months Ended	12 Months Ended
Commitments and Contingencies (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Other Commitments [Line Items]
Rental Expense for office buildings and oil and gas operations equipment	$ 37,000,000us-gaap_OperatingLeasesRentExpenseNet	$ 69,000,000us-gaap_OperatingLeasesRentExpenseNet	$ 50,000,000us-gaap_OperatingLeasesRentExpenseNet
CONSOL Carried Cost Obligation [Member]
Other Commitments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Maximum amount to be paid each calendar year for funding of future drilling and completion costs		400,000,000
Remaining obligation of joint venture's future drilling and completion costs		1,600,000,000
Natural gas price agreed upon benchmark, average		4.00
Marcellus Shale Firm Transportation Agreement [Member]
Other Commitments [Line Items]
Oil and Gas Delivery Commitments and Contracts, Daily Production		320
Long-term Purchase Commitment, Amount		$ 1,500,000,000
Long Term Purchase Commitment, Time Period, Term		15 years