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Investments Accounted for by the Equity Method and Variable Interest Entities - Variable Interest Entities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
project
MW
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]    
Generation capacity (in MW) | MW 23,000  
Equity investments in affiliates $ 412 $ 182
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  
Equity investments in affiliates $ 37  
Gladstone    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 37.50%  
Generation capacity (in MW) | MW 1,613  
Equity investments in affiliates $ 140