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Investments Investments (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Loss on impairments and divestitures of equity investments, net (Note 4) | $ 150 | $ 610 | $ 30
Preferred stock, shares issued (in shares) | shares | 1,600,000 | 1,600,000 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest | $ (684) | $ (408) | $ (96)
Florida Gas Transmission Company, L.L.C. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Miles Of Pipeline | 5,300 |  |
Ruby |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Loss on impairments and divestitures of equity investments, net (Note 4) |  | 250 |
MEP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Loss on impairments and divestitures of equity investments, net (Note 4) |  | $ 350 |
Double Eagle Pipeline LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Liberty Pipeline Group LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Energy Transfers Partners L.P. | Fayetteville Express |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Energy Transfers Partners L.P. | Liberty Pipeline Group LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Magellan Midstream Partners [Member] | Double Eagle Pipeline LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Citrus Corporation |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Citrus Corporation | Energy Transfers Partners L.P. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=99375318&loc=d3e32787-111569 + Details
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