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Other Investments (Details) - Greece [Member] $ in Millions	3 Months Ended
	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

Commitment to Purchase a percentage of Equity Ownership at a future point in time.

+ References

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- Definition

Future Payment to Increase Equity in Investment

+ References

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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

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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

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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

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