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BORROWINGS - Additional Information (Details)
 2 Months Ended 12 Months Ended
Oct. 10, 2017
USD ($)
Oct. 10, 2017
CAD ($)
Mar. 13, 2018
USD ($)
Dec. 31, 2017
USD ($)
extension
Feb. 14, 2018
USD ($)
Dec. 31, 2017
CAD ($)
extension
Apr. 17, 2017
USD ($)
Apr. 17, 2017
CAD ($)
Feb. 22, 2017
USD ($)
Feb. 22, 2017
CAD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings       $ 10,164,000,000             $ 8,326,000,000  
Letter of credit outstanding amount       106,000,000             46,000,000  
Subsequent Event                        
Disclosure of detailed information about borrowings [line items]                        
Cancellation of letters of credit     $ 59,000,000                  
Corporate revolving credit facility                        
Disclosure of detailed information about borrowings [line items]                        
Credit facility, maximum borrowing capacity       $ 1,975,000,000.000                
Unused commitment fee       0.18%   0.18%            
Subsidiary and corporate borrowings       $ 789,000,000             0  
Letter of credit outstanding amount       $ 106,000,000             46,000,000  
Corporate revolving credit facility | Floating interest rate                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, adjustment to interest rate basis       1.20%   1.20%            
Non-recourse borrowings                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings       $ 8,063,000,000             7,324,000,000  
Increase in borrowings       739,000,000                
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities       379,000,000                
Increase (decrease) through financing cash flows, liabilities arising from financing activities       360,000,000                
Non-recourse borrowings | CAD                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings       397,000,000   $ 499,000,000         263,000,000 $ 354,000,000
Non-recourse borrowings | USD                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings       3,087,000,000             3,039,000,000  
Medium-term notes, maturing February 22, 2024                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings       $ 239,000,000             0  
Medium-term notes, maturing February 22, 2024 | Debt Issuers                        
Disclosure of detailed information about borrowings [line items]                        
Face amount                   $ 300,000,000    
Medium-term notes, maturing February 22, 2024 | Fixed interest rate                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, interest rate       3.30%   3.30% 3.30% 3.30%        
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, interest rate             3.10% 3.10% 3.30% 3.30%    
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, interest rate             4.00% 4.00% 4.10% 4.10%    
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | Debt Issuers | CAD                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, interest rate                 3.30% 3.30%    
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | Debt Issuers | USD                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, interest rate                 4.10% 4.10%    
Medium-term notes, maturing February 22, 2024 | Debt issuance                        
Disclosure of detailed information about borrowings [line items]                        
Face amount             $ 309,000,000 $ 400,000,000 $ 228,000,000 $ 300,000,000    
Medium Term Notes, Public - Canadian - Maturing October 10, 2017                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings       $ 0             295,000,000  
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Debt Issuers                        
Disclosure of detailed information about borrowings [line items]                        
Amount repaid $ 306,000,000 $ 400,000,000                    
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Fixed interest rate                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, interest rate       3.50%   3.50%            
Corporate borrowings                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings       $ 2,101,000,000             1,002,000,000  
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities       79,000,000                
Revolving credit facility with Brookfield                        
Disclosure of detailed information about borrowings [line items]                        
Credit facility, maximum borrowing capacity       $ 500,000,000                
Borrowings, number of extensions | extension       4   4            
Subsidiary and corporate borrowings       $ 0             $ 0  
Revolving credit facility with Brookfield | Floating interest rate                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings, adjustment to interest rate basis       2.00%   2.00%            
Commitment fees       $ 0                
Revolving credit facility with Brookfield | Subsequent Event                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings     $ 400,000,000                  
Senior secured notes | Subsequent Event | North American gas storage operation                        
Disclosure of detailed information about borrowings [line items]                        
Subsidiary and corporate borrowings         $ 400,000,000              
Borrowings, interest rate         7.00%