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Notes to the Consolidated Financial Statements Notes to the Consolidated Financial Statements - Narrative (Details) - business_unit | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Nov. 27, 2018 | Mar. 09, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of business units | 2 |  |
Atlantica Yield |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interest | 41.50% | 16.50% | 25.00%

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