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Variable Interest Entities, or VIEs (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 02, 2016
Jun. 30, 2018
USD ($)
facility
MW
Jun. 30, 2018
USD ($)
facility
project
MW
Jun. 29, 2018
Dec. 31, 2017
USD ($)
Investments Accounted for by the Equity Method          
Equity investments in affiliates   $ 1,055 $ 1,055   $ 1,038
Generation capacity (in MW) | MW   30,000 30,000    
Economic interest in equity method investments (as a percent)       3.70%  
Loss on deconsolidation and subsequent recognition     $ 22    
Deficit restoration obligation   $ 83 83    
Current assets   191 191   118
Net property, plant and equipment   2,709 2,709   2,337
Other long-term assets   660 660   658
Total assets   3,560 3,560   3,113
Current liabilities   119 119   96
Long-term debt   814 814   661
Other long-term liabilities   211 211   209
Total liabilities   1,144 1,144   966
Redeemable noncontrolling interest   69 69   78
Noncontrolling interest   660 660   507
Net assets less noncontrolling interest   1,687 1,687   $ 1,562
GenConn Energy LLC          
Investments Accounted for by the Equity Method          
Equity investments in affiliates   $ 100 $ 100    
Power generation facilities | facility   2 2    
Generation capacity (in MW) | MW   190 190    
Economic interest in equity method investments (as a percent)   50.00% 50.00%    
Ivampah Mater Holdings LLC          
Investments Accounted for by the Equity Method          
Equity investments in affiliates   $ 57 $ 57    
Generation capacity (in MW) | MW   392 392    
Economic interest in equity method investments (as a percent)   54.60% 54.60%    
Number of solar electric generating projects | project     3    
Release of reserve funds   $ (95)      
Deconsolidation reduced the Company's assets     $ 1,300    
Deconsolidation reduced the Company's liabilities     1,200    
Sun Edison Utility-Scale Solar and Wind | Mechanically-complete Solar Assets          
Investments Accounted for by the Equity Method          
PPA period 20 years        
Equity investments in affiliates   $ 338 $ 338