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Divested Operations - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 20, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
May 21, 2018
km
MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impairment expense   $ 0 $ 3 $ 0 $ 7  
El Arrayan SPA | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage           71.00%
Distance of facility from Santiago | km           400
Generating capacity | MW           81
Cash proceeds $ 70          
Impairment expense     $ 3      
Impairment loss         $ 7