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BORROWINGS - Additional Information (Details)
 12 Months Ended
Nov. 06, 2019
CAD ($)
Oct. 30, 2018
CAD ($)
Oct. 10, 2017
CAD ($)
Dec. 31, 2019
USD ($)
extension
Oct. 07, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Sep. 10, 2018
CAD ($)
Disclosure of detailed information about borrowings [line items]              
Letter of credit outstanding amount       $ 54,000,000   $ 47,000,000  
Notional Amount (U.S. Dollars)       15,855,000,000   9,966,000,000  
Corporate revolving credit facility              
Disclosure of detailed information about borrowings [line items]              
Credit facility, maximum borrowing capacity       $ 1,975,000,000.000      
Basis points       0.13%      
Non-recourse borrowings       $ 820,000,000   510,000,000  
Letter of credit outstanding amount       54,000,000   47,000,000  
Increase (decrease) in corporate borrowings       $ 310,000,000      
Corporate revolving credit facility | Floating interest rate              
Disclosure of detailed information about borrowings [line items]              
Borrowings, adjustment to interest rate basis       1.20%      
Medium-term Notes, Maturing October 9, 2029              
Disclosure of detailed information about borrowings [line items]              
Non-recourse borrowings       $ 386,000,000   0  
Notional Amount (U.S. Dollars)         $ 500,000,000    
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate       3.40%      
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate | Debt Issuers | CAD              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate         3.40%    
Medium Term Notes, Public - Canadian - Maturing October 30, 2020              
Disclosure of detailed information about borrowings [line items]              
Non-recourse borrowings       $ 0   275,000,000  
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Debt Issuers              
Disclosure of detailed information about borrowings [line items]              
Amount repaid $ 375,000,000            
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate       3.50%      
Medium Term Notes, Maturing October 30, 2018 | Debt Issuers              
Disclosure of detailed information about borrowings [line items]              
Amount repaid   $ 125,000,000 $ 400,000,000        
Medium-term Notes, Maturing September 11, 2028              
Disclosure of detailed information about borrowings [line items]              
Non-recourse borrowings       $ 384,000,000   365,000,000  
Notional Amount (U.S. Dollars)             $ 500,000,000
Medium-term Notes, Maturing September 11, 2028 | Debt Issuers              
Disclosure of detailed information about borrowings [line items]              
Notional Amount (U.S. Dollars)             $ 500,000,000
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate       4.20%      
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate | Debt Issuers | CAD              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate             4.20%
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate | Debt Issuers | USD              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate             4.70%
Corporate borrowings              
Disclosure of detailed information about borrowings [line items]              
Non-recourse borrowings       $ 2,475,000,000   1,993,000,000  
Increase (decrease) in corporate borrowings       482,000,000      
Revolving credit facility with Brookfield              
Disclosure of detailed information about borrowings [line items]              
Credit facility, maximum borrowing capacity       500,000,000      
Non-recourse borrowings       $ 0   0  
Borrowings, number of extensions | extension       4      
Revolving credit facility with Brookfield | Floating interest rate              
Disclosure of detailed information about borrowings [line items]              
Borrowings, adjustment to interest rate basis       2.00%      
Commitment fees       $ 0      
Non-recourse borrowings              
Disclosure of detailed information about borrowings [line items]              
Non-recourse borrowings       18,544,000,000   13,113,000,000  
Increase in borrowings       5,400,000,000      
Non-recourse borrowings | CAD              
Disclosure of detailed information about borrowings [line items]              
Non-recourse borrowings       2,473,000,000   1,388,000,000  
Non-recourse borrowings | USD              
Disclosure of detailed information about borrowings [line items]              
Non-recourse borrowings       $ 7,801,000,000   $ 5,317,000,000