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LONG-TERM DEBT - Summary of Long-term Debt (Details)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 22,458,000,000   $ 16,805,000,000
Less: current portion of commercial paper   625,000,000   336,000,000
Current portion of other long-term debt   1,252,000,000   1,476,000,000
Long-term debt   $ 20,581,000,000   14,993,000,000
3.05% debentures due June 19, 2019        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.05% 3.05%    
2.60% debentures due December 3, 2019        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.60% 2.60%    
2.05% debentures due June 1, 2020        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 900,000,000    
Borrowings, interest rate 2.05% 2.05%    
2.89% debentures due August 14, 2020        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.89% 2.89%    
3.31% debentures due February 11, 2022        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 1,000,000,000    
Borrowings, interest rate 3.31% 3.31%    
3.55% debentures due June 3, 2024        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.55% 3.55%    
3.42% debentures due December 1, 2026        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 600,000,000    
Borrowings, interest rate 3.42% 3.42%    
4.85% debentures due May 30, 2047        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 300,000,000    
Borrowings, interest rate 4.85% 4.85%    
Bank credit facilities (December 31, 2017 - US$1,839 million; December 31, 2016 - US$905 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,839,000,000   $ 905,000,000  
Commercial paper (December 31, 2017 - US$500 million; December 31, 2016 - US$250 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount 500,000,000   $ 250,000,000  
5.70% due May 15, 2017 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 1,100,000,000      
Borrowings, interest rate 5.70% 5.70%    
1.75% due January 15, 2018 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 600,000,000      
Borrowings, interest rate 1.75% 1.75%    
5.90% due February 1, 2018 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 400,000,000      
Borrowings, interest rate 5.90% 5.90%    
3.45% due November 15, 2021 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 500,000,000      
Borrowings, interest rate 3.45% 3.45%    
2.95% due January 15, 2023 (US$1,000 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 1,000,000,000      
Borrowings, interest rate 2.95% 2.95%    
3.80% due April 15, 2024 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 500,000,000      
Borrowings, interest rate 3.80% 3.80%    
3.90% due February 1, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 600,000,000      
Borrowings, interest rate 3.90% 3.90%    
3.85% due June 1, 2027 (US$1,250 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 1,250,000,000      
Borrowings, interest rate 3.85% 3.85%    
7.20% due January 15, 2032 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 400,000,000      
Borrowings, interest rate 7.20% 7.20%    
6.45% due June 30, 2033 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 350,000,000      
Borrowings, interest rate 6.45% 6.45%    
5.85% due February 1, 2035 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 350,000,000      
Borrowings, interest rate 5.85% 5.85%    
6.50% due February 15, 2037 (US$450 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 450,000,000      
Borrowings, interest rate 6.50% 6.50%    
6.25% due March 15, 2038 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 1,100,000,000      
Borrowings, interest rate 6.25% 6.25%    
6.75% due February 1, 2039 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 400,000,000      
Borrowings, interest rate 6.75% 6.75%    
4.95% due June 1, 2047 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 750,000,000      
Borrowings, interest rate 4.95% 4.95%    
Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 22,597,000,000   16,870,000,000
Gross carrying amount | Bank credit facilities        
Disclosure of detailed information about borrowings [line items]        
Borrowings   3,544,000,000   2,758,000,000
Gross carrying amount | 3.05% debentures due June 19, 2019        
Disclosure of detailed information about borrowings [line items]        
Borrowings   500,000,000   500,000,000
Gross carrying amount | 2.60% debentures due December 3, 2019        
Disclosure of detailed information about borrowings [line items]        
Borrowings   500,000,000   500,000,000
Gross carrying amount | 2.05% debentures due June 1, 2020        
Disclosure of detailed information about borrowings [line items]        
Borrowings   900,000,000   0
Gross carrying amount | 2.89% debentures due August 14, 2020        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,000,000,000   1,000,000,000
Gross carrying amount | 3.31% debentures due February 11, 2022        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,000,000,000   1,000,000,000
Gross carrying amount | 3.55% debentures due June 3, 2024        
Disclosure of detailed information about borrowings [line items]        
Borrowings   500,000,000   500,000,000
Gross carrying amount | 3.42% debentures due December 1, 2026        
Disclosure of detailed information about borrowings [line items]        
Borrowings   600,000,000   0
Gross carrying amount | 4.85% debentures due May 30, 2047        
Disclosure of detailed information about borrowings [line items]        
Borrowings   300,000,000   0
Gross carrying amount | Medium-term notes        
Disclosure of detailed information about borrowings [line items]        
Borrowings   8,844,000,000   6,258,000,000
Gross carrying amount | Bank credit facilities (December 31, 2017 - US$1,839 million; December 31, 2016 - US$905 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   2,300,000,000   1,213,000,000
Gross carrying amount | Commercial paper (December 31, 2017 - US$500 million; December 31, 2016 - US$250 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   625,000,000   336,000,000
Gross carrying amount | 5.70% due May 15, 2017 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   0   1,477,000,000
Gross carrying amount | 1.75% due January 15, 2018 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   751,000,000   806,000,000
Gross carrying amount | 5.90% due February 1, 2018 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   501,000,000   537,000,000
Gross carrying amount | 3.45% due November 15, 2021 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   625,000,000   671,000,000
Gross carrying amount | 2.95% due January 15, 2023 (US$1,000 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,252,000,000   0
Gross carrying amount | 3.80% due April 15, 2024 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   625,000,000   671,000,000
Gross carrying amount | 3.90% due February 1, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   751,000,000   806,000,000
Gross carrying amount | 3.85% due June 1, 2027 (US$1,250 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,566,000,000   0
Gross carrying amount | 7.20% due January 15, 2032 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   501,000,000   537,000,000
Gross carrying amount | 6.45% due June 30, 2033 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   438,000,000   470,000,000
Gross carrying amount | 5.85% due February 1, 2035 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   438,000,000   470,000,000
Gross carrying amount | 6.50% due February 15, 2037 (US$450 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   563,000,000   604,000,000
Gross carrying amount | 6.25% due March 15, 2038 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,377,000,000   1,477,000,000
Gross carrying amount | 6.75% due February 1, 2039 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   501,000,000   537,000,000
Gross carrying amount | 4.95% due June 1, 2047 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   939,000,000   0
Gross carrying amount | Long-term debt        
Disclosure of detailed information about borrowings [line items]        
Borrowings   13,753,000,000   10,612,000,000
Original issue discounts, net        
Disclosure of detailed information about borrowings [line items]        
Borrowings   18,000,000   10,000,000
Transaction costs        
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 121,000,000   $ 55,000,000