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Divested Operations	9 Months Ended
Divested Operations	Sep. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]
Divested Operations	Divested Operations Chilean Sale On May 21, 2018, the Company, through its indirect wholly-owned subsidiaries, entered into a stock purchase agreement with a third party pursuant to which the Company agreed to sell, and the buyer agreed to purchase, certain subsidiaries which hold approximately a 71% interest in El Arrayán Wind and assets and rights relating to ownership and operation of an extension of the trunk transmission system in Chile (Chilean Sale). El Arrayán Wind is a wind electric generation facility located approximately 400 kilometers north of Santiago on the coast of Chile in which the Company had an owned interest of approximately 81 MW. On August 20, 2018, the Company completed the Chilean Sale for cash proceeds of $70 million. The Company measured impairment expense as the difference between the carrying amount of the net assets and the sales price less estimated costs to sell. As a result, the Company recorded a total impairment expense of $3 million and $7 million for the three and nine months ended September 30, 2018, respectively.