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Variable Interest Entities, or VIEs (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
project
MW
Dec. 31, 2017
USD ($)
Investments Accounted for by the Equity Method      
Generation capacity (in MW) | MW   26,000  
Loss on deconsolidation and subsequent recognition   $ 22  
Equity investments in affiliates   452 $ 182
Current assets   6 6
Net property, plant and equipment   76 80
Other long-term assets   31 36
Total assets   113 122
Current liabilities   2 3
Long-term debt   29 30
Other long-term liabilities   8 7
Total liabilities   39 40
Redeemable noncontrolling interest   19 19
Net assets less noncontrolling interests   $ 55 $ 63
Ivampah Master Holdings LLC      
Investments Accounted for by the Equity Method      
Economic interest in equity method investments (as a percent)   54.60%  
Number of solar electric generating projects | project   3  
Generation capacity (in MW) | MW   392  
Release of reserve funds $ (95)    
Deconsolidation reduced the Company's assets   $ 1,300  
Deconsolidation reduced the Company's liabilities   1,200  
Equity investments in affiliates   $ 45