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LONG-TERM DEBT - Narrative (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2018
CAD ($)
Mar. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2017
CAD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2017
CAD ($)
Disclosure of detailed information about borrowings [line items]                    
Letters of credit and guarantees outstanding           $ 450,000,000        
Bank credit facilities                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           4,976,000,000        
Undrawn borrowing facilities           4,723,000,000        
Term Credit Facility                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           4,750,000,000        
Demand credit facility                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           100,000,000 £ 15,000,000      
Non-revolving term credit facility maturing May 2020                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           1,800,000,000   $ 3,000,000,000    
Repayments of lines of credit $ 1,050,000,000 $ 150,000,000   $ 1,200,000,000            
Non-revolving term credit facility maturing October 2020                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           2,200,000,000        
Non-Revolving Term Credit Facility Maturing February 2019                    
Disclosure of detailed information about borrowings [line items]                    
Repayments of lines of credit       $ 125,000,000            
Non-revolving term credit facility maturing February 2020                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           750,000,000        
Commercial Paper                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           2,500,000,000        
Notional amount     $ 104,000,000   $ 500,000,000          
Revolving syndicated credit facility                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           2,425,000,000        
Revolving syndicated credit facility maturing June 2019                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           330,000,000        
Revolving syndicated credit facility maturing June 2021                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           2,095,000,000        
Revolving syndicated credit facility maturing June 2022                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           $ 2,425,000,000        
Credit facilities and commercial paper | Weighted average                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     2.60%   2.20% 2.60% 2.60% 2.20%    
Long-term debt | Weighted average                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     3.90%   3.80% 3.90% 3.90% 3.80%    
2.05% debentures due June 1, 2020                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     2.05%   2.05% 2.05% 2.05% 2.05%    
Notional amount               $ 900,000,000    
3.42% debentures due December 1, 2026                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     3.42%   3.42% 3.42% 3.42% 3.42%    
Notional amount               $ 600,000,000    
4.85% debentures due May 30, 2047                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     4.85%   4.85% 4.85% 4.85% 4.85%    
Notional amount               $ 300,000,000    
Medium-Term Borrowings Expiring August 2019                    
Disclosure of detailed information about borrowings [line items]                    
Base shell prospectus borrowings                   $ 3,000,000,000
1.75% due January 15, 2018 (US$600 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     1.75%   1.75% 1.75% 1.75% 1.75%    
Notional amount         $ 600,000,000          
Repayments of borrowings     $ 600,000,000              
5.90% due February 1, 2018 (US$400 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     5.90%   5.90% 5.90% 5.90% 5.90%    
Notional amount         $ 400,000,000          
Repayments of borrowings     $ 400,000,000              
5.70% due May 15, 2017 (US$1,100 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate         5.70%     5.70%    
Repayments of borrowings         $ 1,100,000,000          
2.95% due January 15, 2023 (US$1,000 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     2.95%   2.95% 2.95% 2.95% 2.95%    
Notional amount     $ 1,000,000,000   $ 1,000,000,000          
3.85% due June 1, 2027 (US$1,250 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     3.85%   3.85% 3.85% 3.85% 3.85%    
Notional amount     $ 1,250,000,000   $ 1,250,000,000          
4.95% due June 1, 2047 (US$750 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     4.95%   4.95% 4.95% 4.95% 4.95%    
Notional amount     $ 750,000,000   $ 750,000,000          
US dollar denominated debt, unsecured                    
Disclosure of detailed information about borrowings [line items]                    
Base shell prospectus borrowings                 $ 3,000,000,000