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ACQUISITIONS - Biotherm (Details)
$ in Millions
1 Months Ended
Dec. 28, 2017
USD ($)
company
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
TerraForm Global      
Disclosure of detailed information about business combination [line items]      
Identifiable assets acquired (liabilities assumed) $ 56    
Number of companies included in acquisition | company 3    
Consideration transferred, acquisition-date fair value     $ 657
Biotherm      
Disclosure of detailed information about business combination [line items]      
Identifiable assets acquired (liabilities assumed)   $ 71  
Consideration transferred, acquisition-date fair value   71  
Total cash consideration transferred   12  
Contingent liabilities recognised as of acquisition date   3  
Acquisition costs (less than)   $ 1  
Bottom of range | TerraForm Global      
Disclosure of detailed information about business combination [line items]      
Acquisition of controlling interests, percent 0.65    
Top of range | TerraForm Global      
Disclosure of detailed information about business combination [line items]      
Acquisition of controlling interests, percent 0.70