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Variable Interest Entities, or VIEs (Details)
$ in Millions
Nov. 02, 2016
Mar. 31, 2018
USD ($)
facility
MW
Dec. 31, 2017
USD ($)
Investments Accounted for by the Equity Method      
Equity investments in affiliates   $ 1,011 $ 1,038
Generation capacity (in MW) | MW   30,000  
Deficit restoration obligation   $ 81  
Current assets   171 118
Net property, plant and equipment   2,712 2,337
Other long-term assets   665 658
Total assets   3,548 3,113
Current liabilities   111 96
Long-term debt   856 661
Other long-term liabilities   211 209
Total liabilities   1,178 966
Redeemable noncontrolling interest   80 78
Noncontrolling interests   646 507
Net assets less noncontrolling interests   1,644 $ 1,562
GenConn Energy LLC      
Investments Accounted for by the Equity Method      
Equity investments in affiliates   $ 100  
Power generation facilities | facility   2  
Generation capacity (in MW) | MW   190  
Economic interest in equity method investments (as a percent)   50.00%  
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