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Acquisitions, Discontinued Operations and Dispositions - Sale of Assets to NRG Yield, Inc. Prior to Discontinued Operations (Details)
$ in Millions
Sep. 30, 2018
MW
Jun. 19, 2018
USD ($)
Mar. 30, 2018
USD ($)
MW
Mar. 27, 2017
USD ($)
MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Generation capacity (in MW) | MW 26,000      
UPMC Thermal Project        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash consideration   $ 84    
Buckthorn Renewables, LLC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash consideration     $ 42  
Percentage of ownership sold     100.00%  
Generation capacity (in MW) | MW     154  
Assumed non-recourse debt in transaction     $ 183  
Agua Caliente solar project        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash consideration       $ 130
Assumed non-recourse debt in transaction       328
Working capital adjustments       $ 1
Agua Caliente solar project | Agua Caliente        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percentage of ownership sold       16.00%
Generation capacity (in MW) | MW       46
Agua Caliente solar project | Utah Portfolio        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Generation capacity (in MW) | MW       265
Number of utility scale solar projects | MW       7