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Long-Term Debt - Summary of Long-term Debt (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 20,982   $ 20,623
Less: current portion of commercial paper   329   141
Current portion of other long-term debt   2,062   1,000
Long-term debt   $ 18,591   $ 19,482
3.05% debentures due June 19, 2019        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.05% 3.05% 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% 2.60% 2.60%
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%    
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%    
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, 2019 – US$3,745 million; December 31, 2018 – US$2,954 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 3,745,000,000   $ 2,954,000,000  
Commercial paper (December 31, 2019 – US$254 million; December 31, 2018 – US$104 million)        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 254,000,000   $ 104,000,000  
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      
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      
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   $ 21,090   $ 20,742
Gross carrying amount | Bank credit facilities        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,688   831
Gross carrying amount | 3.05% debentures due June 19, 2019        
Disclosure of detailed information about borrowings [line items]        
Borrowings   0   500
Gross carrying amount | 2.60% debentures due December 3, 2019        
Disclosure of detailed information about borrowings [line items]        
Borrowings   0   500
Gross carrying amount | 2.05% debentures due June 1, 2020        
Disclosure of detailed information about borrowings [line items]        
Borrowings   900   900
Gross carrying amount | 2.89% debentures due August 14, 2020        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,000   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 | 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 | 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   5,988   6,131
Gross carrying amount | Bank credit facilities (December 31, 2019 – US$3,745 million; December 31, 2018 – US$2,954 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   4,855   4,031
Gross carrying amount | Commercial paper (December 31, 2019 – US$254 million; December 31, 2018 – US$104 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   329   141
Gross carrying amount | 3.45% due November 15, 2021 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   648   682
Gross carrying amount | 2.95% due January 15, 2023 (US$1,000 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,296   1,364
Gross carrying amount | 3.80% due April 15, 2024 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   648   682
Gross carrying amount | 3.90% due February 1, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   778   819
Gross carrying amount | 3.85% due June 1, 2027 (US$1,250 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,621   1,706
Gross carrying amount | 7.20% due January 15, 2032 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   519   546
Gross carrying amount | 6.45% due June 30, 2033 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   454   478
Gross carrying amount | 5.85% due February 1, 2035 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   454   478
Gross carrying amount | 6.50% due February 15, 2037 (US$450 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   583   614
Gross carrying amount | 6.25% due March 15, 2038 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   1,426   1,501
Gross carrying amount | 6.75% due February 1, 2039 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   519   546
Gross carrying amount | 4.95% due June 1, 2047 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   972   1,023
Gross carrying amount | Long-term debt        
Disclosure of detailed information about borrowings [line items]        
Borrowings   15,102   14,611
Original issue discounts, net        
Disclosure of detailed information about borrowings [line items]        
Borrowings   17   17
Transaction costs        
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 91   $ 102