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Investments Accounted for by the Equity Method and Variable Interest Entities - Variable Interest Entities (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2019
project
MW
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]      
Generation capacity (in MW) | MW   23,000  
Ivanpah Master Holdings LLC      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   54.50%  
Number of solar electric generating projects | project   3  
Generation capacity (in MW) | MW   393  
Release of reserves to fund equity distributions $ 95    
Loss on deconsolidation     $ 22
Reduction of assets due to deconsolidation     1,300
Reduction of liabilities due to deconsolidation     $ 1,200
Gladstone      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   37.50%  
Generation capacity (in MW) | MW   1,613