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Investments Accounted for by the Equity Method and Variable Interest Entities - Variable Interest Entities (Details)
$ in Millions
 1 Months Ended
Apr. 30, 2009
Dec. 31, 2017
USD ($)
MW
facility
Dec. 31, 2016
USD ($)
Nov. 02, 2016
MW
Sep. 17, 2013
USD ($)
Schedule of Equity Method Investments [Line Items]          
Generation capacity (in MW) | MW   30,000      
Equity investments in affiliates   $ 1,038 $ 1,120    
Long-term debt   16,633 16,704    
Amount drawn on working capital facility   14      
Non Recourse Debt          
Schedule of Equity Method Investments [Line Items]          
Long-term debt   9,451 $ 8,909    
GenConn          
Schedule of Equity Method Investments [Line Items]          
Equity investments in affiliates   $ 102      
Ownership percentage   50.00%      
Number of peaking generation facilities | facility   2      
Generation capacity of peaking facility (in MW) | MW   190      
GenConn | GenConn Working Capital Facility          
Schedule of Equity Method Investments [Line Items]          
Term of revolving working capital facility 5 years        
GenConn | Non Recourse Debt | GenConn Facility          
Schedule of Equity Method Investments [Line Items]          
Long-term debt   $ 204     $ 237
Interest rate, stated percentage         4.73%
GenConn | Non Recourse Debt | GenConn Working Capital Facility          
Schedule of Equity Method Investments [Line Items]          
Long-term debt         $ 35
Interest rate, stated percentage         1.875%
Mechanically-complete Solar Assets | Sun Edison Utility-Scale Solar and Wind          
Schedule of Equity Method Investments [Line Items]          
Generation capacity (in MW) | MW       530  
Equity investments in affiliates   $ 345