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BORROWINGS - Additional Information (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2019
USD ($)
extension
Dec. 31, 2018
USD ($)
Sep. 10, 2018
CAD ($)
Corporate revolving credit facility      
Disclosure of detailed information about borrowings [line items]      
Credit facility, maximum borrowing capacity $ 1,975,000,000    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.18%    
Subsidiary and corporate borrowings $ 0 $ 510,000,000  
Letter of credit outstanding amount $ 48,000,000 47,000,000  
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 September 11, 2028 [Domain]      
Disclosure of detailed information about borrowings [line items]      
Subsidiary and corporate borrowings $ 382,000,000 365,000,000  
Notional amount     $ 500
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 4.20%    
Revolving credit facility with Brookfield      
Disclosure of detailed information about borrowings [line items]      
Credit facility, maximum borrowing capacity $ 500,000,000    
Subsidiary and corporate 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    
Corporate borrowings      
Disclosure of detailed information about borrowings [line items]      
Subsidiary and corporate borrowings 1,546,000,000 1,993,000,000  
Increase (decrease) in corporate borrowings (447,000,000)    
Increase (decrease) through foreign exchange, financial assets 0.04    
Non-recourse borrowings      
Disclosure of detailed information about borrowings [line items]      
Subsidiary and corporate borrowings 14,200,000,000 $ 13,113,000,000  
Increase in borrowings 1,100,000,000    
Increase (decrease) through financing cash flows, liabilities arising from financing activities $ 900,000,000