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Other Investments (Details) - Greece [Member] - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |
Payments to Acquire Equity Method Investments | $ 18 | $ 19
Equity Method Investment, Ownership Percentage | 40.00% | 20.00%
Equity Method Investment, Commitment to Purchase Ownership Percentage |  | 20.00%
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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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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