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Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
project
MW
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Investments Accounted for by the Equity Method      
Equity investments in affiliates $ 387   $ 412
Generation capacity (in MW) | MW 23,000    
Current assets $ 3   3
Net property, plant and equipment 75   76
Other long-term assets 27   28
Total assets 105   107
Current liabilities 1   2
Long-term debt 29   29
Other long-term liabilities 8   7
Total liabilities 38   38
Redeemable noncontrolling interest 18   19
Net assets less noncontrolling interests 49   $ 50
Agua Caliente      
Investments Accounted for by the Equity Method      
Equity investments in affiliates 201    
Ivampah Master Holdings LLC      
Investments Accounted for by the Equity Method      
Equity investments in affiliates $ 20    
Economic interest in equity method investments (as a percent) 54.50%    
Number of solar electric generating projects | project 3    
Generation capacity (in MW) | MW 393    
Release of reserve funds   $ (95)