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LONG-TERM DEBT - Summary of Long-term Debt (Details)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
CAD ($)
Nov. 12, 2019
USD ($)
Apr. 30, 2019
CAD ($)
Apr. 30, 2019
USD ($)
Jan. 01, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Feb. 08, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]                    
Long-term debt $ 15,967,000,000           $ 13,390,000,000 $ 13,390,000,000    
Deferred transaction costs and discounts (163,000,000)             (114,000,000)    
Less current portion 0           $ (900,000,000) (900,000,000)    
Senior Notes Due 2019 - 2.800% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 400,000,000                  
Interest rate 2.80% 2.80%                
Senior Notes Due 2019 - 5.380% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 500,000,000                  
Interest rate 5.38% 5.38%                
Senior Notes Due 2020                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount     $ 900,000,000              
Senior Notes Due 2020 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 900,000,000                  
Interest rate 4.70% 4.70% 4.70%              
Senior Notes Due 2021 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 1,450,000,000                  
Interest rate 5.34% 5.34%                
Senior Notes Due 2022 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 600,000,000                  
Interest rate 4.00% 4.00%                
Senior Notes Due 2023 - 3.000% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 500,000,000                
Interest rate 3.00% 3.00%                
Senior Notes Due 2023 - 4.100% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 850,000,000                
Interest rate 4.10% 4.10%                
Senior Notes Due 2024 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 600,000,000                  
Interest rate 4.00% 4.00%                
Senior Notes Due 2025 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 700,000,000                
Interest rate 3.625% 3.625%                
Senior Notes Due 2026 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 500,000,000                
Interest rate 2.90% 2.90%                
Senior Notes Due 2029                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount         $ 1,000,000,000          
Interest rate         3.25% 3.25%        
Senior Notes Due 2029 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 1,000,000,000                  
Interest rate 3.25% 3.25%                
Senior Debentures Due 2032 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 200,000,000                
Interest rate 8.75% 8.75%                
Senior Notes Due 2038 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 350,000,000                
Interest rate 7.50% 7.50%                
Senior Notes Due 2039 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 500,000,000                  
Interest rate 6.68% 6.68%                
Senior Notes Due 2040 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 800,000,000                  
Interest rate 6.11% 6.11%                
Senior Notes Due 2041 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount $ 400,000,000                  
Interest rate 6.56% 6.56%                
Senior Notes Due 2043 - 4.500% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 500,000,000                
Interest rate 4.50% 4.50%                
Senior Notes Due 2043 - 5.450% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 650,000,000                
Interest rate 5.45% 5.45%                
Senior Notes Due 2044 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 1,050,000,000                
Interest rate 5.00% 5.00%                
Senior Notes Due 2048                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount                   $ 750,000,000
Interest rate                   4.30%
Senior Notes Due 2048 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 750,000,000                
Interest rate 4.30% 4.30%                
Senior Notes Due 2049 - 4.350%                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount           $ 1,250,000,000        
Interest rate         4.35% 4.35%        
Senior Notes Due 2049 - 4.350% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 1,250,000,000                
Interest rate 4.35% 4.35%                
Senior Notes Due 2049 - 3.700%                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount       $ 1,000,000,000            
Interest rate       3.70%            
Senior Notes Due 2049 - 3.700% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount   $ 1,000,000,000                
Interest rate 3.70% 3.70%                
Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt $ 16,130,000,000             14,404,000,000    
Gross carrying amount | Senior Notes Due 2019 - 2.800% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 0             400,000,000    
Gross carrying amount | Senior Notes Due 2019 - 5.380% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 0             500,000,000    
Gross carrying amount | Senior Notes Due 2020 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 0             900,000,000    
Gross carrying amount | Senior Notes Due 2021 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 1,450,000,000             1,450,000,000    
Gross carrying amount | Senior Notes Due 2022 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 600,000,000             600,000,000    
Gross carrying amount | Senior Notes Due 2023 - 3.000% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   $ 649,000,000             $ 682,000,000  
Gross carrying amount | Senior Notes Due 2023 - 4.100% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   1,104,000,000             1,160,000,000  
Gross carrying amount | Senior Notes Due 2024 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 600,000,000             600,000,000    
Gross carrying amount | Senior Notes Due 2025 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   909,000,000             955,000,000  
Gross carrying amount | Senior Notes Due 2026 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   649,000,000             682,000,000  
Gross carrying amount | Senior Notes Due 2029 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 1,000,000,000             0    
Gross carrying amount | Senior Debentures Due 2032 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   260,000,000             273,000,000  
Gross carrying amount | Senior Notes Due 2038 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   455,000,000             478,000,000  
Gross carrying amount | Senior Notes Due 2039 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 500,000,000             500,000,000    
Gross carrying amount | Senior Notes Due 2040 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt 800,000,000             800,000,000    
Gross carrying amount | Senior Notes Due 2041 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt $ 400,000,000             $ 400,000,000    
Gross carrying amount | Senior Notes Due 2043 - 4.500% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   649,000,000             682,000,000  
Gross carrying amount | Senior Notes Due 2043 - 5.450% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   844,000,000             887,000,000  
Gross carrying amount | Senior Notes Due 2044 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   1,365,000,000             1,433,000,000  
Gross carrying amount | Senior Notes Due 2048 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   973,000,000             1,022,000,000  
Gross carrying amount | Senior Notes Due 2049 - 4.350% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   1,624,000,000             0  
Gross carrying amount | Senior Notes Due 2049 - 3.700% | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt   $ 1,299,000,000             $ 0