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Other Investments (Details) - Greece [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |
Payments to Acquire Equity Method Investments | $ 19
Equity Method Investment, Ownership Percentage | 20.00%
Equity Method Investment, Commitment to Purchase Ownership Percentage | 20.00%
Future Payment to Increase Equity in Investment | $ 20
Commitment to Purchase within next 12 months [Member] |
Schedule of Equity Method Investments [Line Items] |
Equity Method Investment, Commitment to Purchase Ownership Percentage | 10.00%
Commitment to Purchase in year 2 [Member] |
Schedule of Equity Method Investments [Line Items] |
Equity Method Investment, Commitment to Purchase Ownership Percentage | 10.00%

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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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