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Long-Term Debt - Summary of Long-term Debt (Details)
$ in Millions
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 11,445   $ 14,694  
current portion of other long term debt 404   1,000  
Long-term debt 11,041   13,694  
Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings 11,514   14,781  
Original issue discounts, net        
Disclosure of detailed information about borrowings [line items]        
Borrowings 13   15  
Transaction costs        
Disclosure of detailed information about borrowings [line items]        
Borrowings 56   72  
Medium-term notes | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,702   3,200  
3.31% debentures due February 11, 2022        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.31% 3.31%    
3.31% debentures due February 11, 2022 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 0   1,000  
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 $ 404   500  
3.55% debentures due June 3, 2024        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.55% 3.55%    
3.55% debentures due June 3, 2024 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 332   500  
3.42% debentures due December 1, 2026        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.42% 3.42%    
3.42% debentures due December 1, 2026 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 441   600  
2.50% debentures due January 17, 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.50% 2.50%    
2.50% debentures due January 17, 2028 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 225   300  
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 9,812   11,581  
Bank credit facilities (December 31, 2022 – US$nil;
December 31, 2021 – US$901 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 0   $ 901,000,000
Bank credit facilities (December 31, 2022 – US$nil;
December 31, 2021 – US$901 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 0   1,140  
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    
2.95% due January 15, 2023 (US$1,000 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 0   1,266  
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 $ 677   633  
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 $ 812   759  
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 $ 812   759  
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 $ 1,692   1,582  
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 $ 677   633  
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 $ 541   506  
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 $ 474   443  
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 $ 474   443  
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 $ 609   570  
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    
6.25% due March 15, 2038 (US$1,100 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,488   1,392  
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 $ 541   506  
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 $ 1,015   $ 949