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Acquisitions and Divestitures Asset Purchase and Subsequent Sale of Noncontrolling Interest (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 15, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |
Proceeds from noncontrolling interests |  | $ 12 | $ 117 | $ 11 |
Elba Liquification Company LLC [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Payments to Acquire Assets, Investing Activities | $ 185 |  |  |  |
Shell US Gas & Power LLC [Member] | Elba Liquification Company LLC [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 49.00% |  |  |  |
Capacity Subscribed, Percent | 100.00% |  |  |  |
Sale of Equity Interest in Elba Liquification Company LLC [Member] [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 49.00%
Controlling Interest, Ownership Percentage by Parent |  |  |  |  | 51.00%
Other Long-Term Liabilities and Deferred Credits [Member] | Sale of Equity Interest in Elba Liquification Company LLC [Member] [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Proceeds from noncontrolling interests |  | $ 386 |  |  |

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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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