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Long-Term Debt - Summary of Long-term Debt (Details) $ in Millions | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.80% | 3.80% |  |
Borrowings | $ 18,819 |  | $ 10,799 |
Less: current portion of commercial paper | 672 |  | 0 |
current portion of long-term debt | 1,728 |  | 980 |
Long-term debt | 16,419 |  | 9,819 |
Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 18,909 |  | 10,859 |
Original issue discounts, net |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 12 |  | 11 |
Transaction costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 78 |  | 49 |
Medium-term notes | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 1,466 |  | 1,286 |
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 | $ 0 |  | 320 |
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 |  | 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% debentures due January 17, 2028 | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 225 |  | 225 |
4.15% debentures due December 15, 2031 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 4.15% | 4.15% |  |
Borrowings | $ 500 |  |  |
4.15% debentures due December 15, 2031 | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 500 |  | 0 |
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 |
Bank credit facilities (December 31, 2024 – US$3,393 million; December 31, 2023 – US$nil) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | $ 3,393,000,000 |  | $ 0
Bank credit facilities (December 31, 2024 – US$3,393 million; December 31, 2023 – US$nil) | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 4,888 |  | 0 |
Commercial paper (December 31, 2024 – US$467 million;  December 31, 2023 – US$nil) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 672 | $ 467,000,000 |  | $ 0
Commercial paper (December 31, 2024 – US$467 million;  December 31, 2023 – US$nil) | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 672 |  | 0 |
US Dollar Denominated Debt | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 17,443 |  | 9,573 |
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 | $ 0 |  | 660 |
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 |  |
Borrowings |  | $ 600,000,000 |  |
3.90% due February 1, 2025 (US$600 million) | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 864 |  | 792 |
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 | $ 864 |  | 792 |
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 | $ 1,801 |  | 1,651 |
5.00% due December 15, 2029 (US$750 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 5.00% | 5.00% |  |
Notional amount |  | $ 750,000,000 |  |
Borrowings |  | $ 750,000,000 |  |
5.00% due December 15, 2029 (US$750 million) | Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 1,080 |  | 0 |
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 | $ 720 |  | 660 |
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 | $ 576 |  | 528 |
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 | $ 504 |  | 462 |
5.40% due December 15, 2034 (US$750 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 5.40% | 5.40% |  |
Notional amount |  | $ 750,000,000 |  |
Borrowings | $ 1,080 | $ 750,000,000 | 0 |
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 | $ 504 |  | 462 |
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 | $ 649 |  | 594 |
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 | $ 1,585 |  | 1,453 |
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 | $ 576 |  | 528 |
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 | $ 1,080 |  | $ 991 |

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