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Long-Term Debt - Summary of Long-term Debt (Details)
$ in Millions
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 10,799   $ 11,445  
Current portion of long-term debt 980   404  
Long-term debt 9,819   11,041  
Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings 10,859   11,514  
Original issue discounts, net        
Disclosure of detailed information about borrowings [line items]        
Borrowings 11   13  
Transaction costs        
Disclosure of detailed information about borrowings [line items]        
Borrowings 49   56  
Medium-term notes | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,286   $ 1,702  
1.45% debentures due November 16, 2023        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate     1.45% 1.45%
1.45% debentures due November 16, 2023 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 0   $ 404  
3.55% debentures due June 3, 2024        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.55% 3.55% 3.55% 3.55%
3.55% debentures due June 3, 2024 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 320   $ 332  
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% debentures due December 1, 2026 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 441   $ 441  
2.50% debentures due January 17, 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.50% 2.50% 2.50% 2.50%
2.50% debentures due January 17, 2028 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 225   $ 225  
4.85% debentures due May 30, 2047        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 4.85% 4.85%    
4.85% debentures due May 30, 2047 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 300   300  
Long-term debt | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 9,573   9,812  
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    
3.80% due April 15, 2024 (US$500 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 660   677  
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    
3.90% due February 1, 2025 (US$600 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 792   812  
2.05% due July 15, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.05% 2.05%    
Notional amount   $ 600,000,000    
2.05% due July 15, 2025 (US$600 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 792   812  
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    
3.85% due June 1, 2027 (US$1,250 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,651   1,692  
2.95% due July 15, 2030 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.95% 2.95%    
Notional amount   $ 500,000,000    
2.95% due July 15, 2030 (US$500 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 660   677  
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    
7.20% due January 15, 2032 (US$400 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 528   541  
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    
6.45% due June 30, 2033 (US$350 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 462   474  
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    
5.85% due February 1, 2035 (US$350 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 462   474  
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    
6.50% due February 15, 2037 (US$450 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 594   609  
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   $ 1,100,000,000
6.25% due March 15, 2038 (US$1,100 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,453   1,488  
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    
6.75% due February 1, 2039 (US$400 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 528   541  
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    
4.95% due June 1, 2047 (US$750 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 991   $ 1,015