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Equity Method Investments - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2014 mi | Apr. 30, 2012 USD ($) mi | Dec. 31, 2016 USD ($) investment
Schedule of Equity Method Investments [Line Items] |  |  |
Number of investments | investment |  |  | 2
Transcontinental Gas Pipe Line Company LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Entity's equity interest in construction agreement (as a percent) | 61.00% |  |
Constitution Pipeline Company, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as a percent) |  | 25.00% |
Length of pipeline to be constructed (in miles) | mi |  | 124 |
Contribution cap |  | $ 250,000,000 |
Meade Pipeline Co LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (as a percent) | 20.00% |  |
Length of pipeline to be constructed (in miles) | mi | 177 |  |
Expected contribution in future years |  |  | $ 120,300,000
Number of year's investment expected for contribution |  |  | 3 years
Entity's equity interest in construction agreement (as a percent) | 39.00% |  |
Equity Method Investment Commitment [Member] | Constitution Pipeline Company, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Expected contribution in future years |  |  | $ 148,900,000
Number of year's investment expected for contribution |  |  | 3 years
Anticipated contributions |  |  | $ 240,000,000
Contributions to date |  |  | $ 88,500,000

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- Definition Represents the contribution cap of investment. + References No definition available. + Details
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- Definition Represents the amount of expected contribution to be made by the entity for fund cost associated with the jointly owned pipeline in future years. + References No definition available. + Details
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- Definition The proportionate share of interest (percent) in a jointly owned pipeline. + References No definition available. + Details
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- Definition Represents the period for which the investment is expected for contribution. + 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=66011266&loc=d3e33918-111571 + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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