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BORROWINGS - Non-Recourse Borrowings (Details)
$ in Millions, $ in Millions
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 10, 2018
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Current Non-recourse Borrowings And Current Portion of Non-current Non-recourse Borrowings $ 1,028 $ 985  
Non-current Portion Of Non-current Non-recourse Borrowings 13,172 12,128  
Medium-term Notes, Maturing September 11, 2028 [Domain]      
Disclosure of detailed information about borrowings [line items]      
Notional amount     $ 500
Total 382 365  
Non-recourse borrowings      
Disclosure of detailed information about borrowings [line items]      
Total $ 14,200 $ 13,113  
Debt Issuers | Medium-term Notes, Maturing September 11, 2028 [Domain]      
Disclosure of detailed information about borrowings [line items]      
Notional amount     $ 500