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Long-Term Debt - Summary of Long-term Debt (Details)
$ in Millions
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 21,453   $ 20,982  
Less: current portion of commercial paper 544   329  
Current portion of other long-term debt 799   2,062  
Long-term debt $ 20,110   18,591  
2.05% debentures due June 1, 2020        
Disclosure of detailed information about borrowings [line items]        
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]        
Borrowings, interest rate 3.31% 3.31%    
1.45% debentures due November 16, 2023        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 1.45% 1.45%    
Borrowings $ 500      
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]        
Borrowings, interest rate 3.42% 3.42%    
2.50% debentures due January 17, 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.50% 2.50%    
Borrowings $ 300      
4.85% debentures due May 30, 2047        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 4.85% 4.85%    
Bank credit facilities (December 31, 2020 – US$3,953 million;
December 31, 2019 – US$3,745 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 3,953,000,000   $ 3,745,000,000
Commercial paper (December 31, 2020 – US$426 million; 
December 31, 2019 – US$254 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 544 $ 426,000,000   $ 254,000,000
3.45% due November 15, 2021 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.45% 3.45%    
Notional amount   $ 500,000,000    
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%    
Notional amount   $ 1,000,000,000    
3.80% due April 15, 2024 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.80% 3.80%    
Notional amount   $ 500,000,000    
3.90% due February 1, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.90% 3.90%    
Notional amount   $ 600,000,000    
2.05% due July 15, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.05% 2.05%    
Borrowings   $ 600,000,000    
Notional amount   $ 600,000,000    
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%    
Notional amount   $ 1,250,000,000    
2.95% due July 15, 2030 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.95% 2.95%    
Borrowings   $ 500,000,000    
Notional amount   $ 500,000,000    
7.20% due January 15, 2032 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 7.20% 7.20%    
Notional amount   $ 400,000,000    
6.45% due June 30, 2033 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.45% 6.45%    
Notional amount   $ 350,000,000    
5.85% due February 1, 2035 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 5.85% 5.85%    
Notional amount   $ 350,000,000    
6.50% due February 15, 2037 (US$450 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.50% 6.50%    
Notional amount   $ 450,000,000    
6.25% due March 15, 2038 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.25% 6.25%    
Notional amount   $ 1,100,000,000    
6.75% due February 1, 2039 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.75% 6.75%    
Notional amount   $ 400,000,000    
4.95% due June 1, 2047 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 4.95% 4.95%    
Notional amount   $ 750,000,000    
Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 21,560   21,090  
Gross carrying amount | Bank credit facilities        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,614   1,688  
Gross carrying amount | 2.05% debentures due June 1, 2020        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0   900  
Gross carrying amount | 2.89% debentures due August 14, 2020        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0   1,000  
Gross carrying amount | 3.31% debentures due February 11, 2022        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,000   1,000  
Gross carrying amount | 1.45% debentures due November 16, 2023        
Disclosure of detailed information about borrowings [line items]        
Borrowings 500   0  
Gross carrying amount | 3.55% debentures due June 3, 2024        
Disclosure of detailed information about borrowings [line items]        
Borrowings 500   500  
Gross carrying amount | 3.42% debentures due December 1, 2026        
Disclosure of detailed information about borrowings [line items]        
Borrowings 600   600  
Gross carrying amount | 2.50% debentures due January 17, 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings 300   0  
Gross carrying amount | 4.85% debentures due May 30, 2047        
Disclosure of detailed information about borrowings [line items]        
Borrowings 300   300  
Gross carrying amount | Medium-term notes        
Disclosure of detailed information about borrowings [line items]        
Borrowings 4,814   5,988  
Gross carrying amount | Bank credit facilities (December 31, 2020 – US$3,953 million;
December 31, 2019 – US$3,745 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 5,041   4,855  
Gross carrying amount | Commercial paper (December 31, 2020 – US$426 million; 
December 31, 2019 – US$254 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 544   329  
Gross carrying amount | 3.45% due November 15, 2021 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 638   648  
Gross carrying amount | 2.95% due January 15, 2023 (US$1,000 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,276   1,296  
Gross carrying amount | 3.80% due April 15, 2024 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 638   648  
Gross carrying amount | 3.90% due February 1, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 765   778  
Gross carrying amount | 2.05% due July 15, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 765   0  
Gross carrying amount | 3.85% due June 1, 2027 (US$1,250 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,595   1,621  
Gross carrying amount | 2.95% due July 15, 2030 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 638   0  
Gross carrying amount | 7.20% due January 15, 2032 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 510   519  
Gross carrying amount | 6.45% due June 30, 2033 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 446   454  
Gross carrying amount | 5.85% due February 1, 2035 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 446   454  
Gross carrying amount | 6.50% due February 15, 2037 (US$450 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 574   583  
Gross carrying amount | 6.25% due March 15, 2038 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,403   1,426  
Gross carrying amount | 6.75% due February 1, 2039 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 510   519  
Gross carrying amount | 4.95% due June 1, 2047 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 957   972  
Gross carrying amount | Long-term debt        
Disclosure of detailed information about borrowings [line items]        
Borrowings 16,746   15,102  
Original issue discounts, net        
Disclosure of detailed information about borrowings [line items]        
Borrowings 18   17  
Transaction costs        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 89   $ 91