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Equity Method Investments (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Feb. 28, 2014
Equity Method Investment |  |
Ownership interest (as a percent) |  | 20.00%
Amount of investment |  | $ 149
Contributions | $ 1.2 |
Central Pipleline |  |
Equity Method Investment |  |
Length of pipeline to be constructed (in miles) | 177 |
Transco | Central Pipleline |  |
Equity Method Investment |  |
Proportionate ownership interest (as a percent) |  | 61.00%
Meade Pipeline Co LLC | Central Pipleline |  |
Equity Method Investment |  |
Proportionate ownership interest (as a percent) |  | 39.00%
Minimum |  |
Equity Method Investment |  |
Number of years of investment expected to occur | 3 years |
Maximum |  |
Equity Method Investment |  |
Number of years of investment expected to occur | 4 years |

X
- Definition Represents the length of pipeline to be constructed under the development and construction agreement. + References No definition available. + Details
Name: | cog_DevelopmentAndConstructionAgreementLengthOfPipelineToBeConstructed
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Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition Represents the contributions to fund the cost associated with the project for the period. + References No definition available. + Details
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Balance Type: | debit
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X
- Definition The proportionate share of interest (percent) in a jointly owned pipeline. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the period for which the investment is expected to occur. + References No definition available. + Details
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- Definition This element represents the aggregate cost of investments 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 + Details
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Balance Type: | debit
Period Type: | instant

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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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- Details
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