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Debt and Capital Structure - Schedule Remaining Principal Amounts of U.S. Dollar Denominated Unsecured Notes (Detail) - Long-Term Debt $ in Millions, $ in Millions | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 7,470 |  | $ 7,028
U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 3,800 | $ 5,470 | $ 3,800 | $ 5,028
U.S. Dollar Denominated Unsecured Notes | 5.38% due July 15, 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.38% | 5.38% | 5.38% | 5.38%
Total debt principal | $ 133 | $ 192 | $ 133 | $ 176
U.S. Dollar Denominated Unsecured Notes | 4.25% due April 15, 2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.25% | 4.25% | 4.25% | 4.25%
Total debt principal | $ 373 | $ 537 | $ 373 | $ 493
U.S. Dollar Denominated Unsecured Notes | 4.40% due April 15, 2029 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.40% | 4.40% | 4.40% | 4.40%
Total debt principal | $ 183 | $ 262 | $ 183 | $ 241
U.S. Dollar Denominated Unsecured Notes | 2.65% due January 15, 2032 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 2.65% | 2.65% | 2.65% | 2.65%
Total debt principal | $ 500 | $ 720 | $ 500 | $ 661
U.S. Dollar Denominated Unsecured Notes | 5.25% due June 15, 2037 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.25% | 5.25% | 5.25% | 5.25%
Total debt principal | $ 333 | $ 479 | $ 333 | $ 441
U.S. Dollar Denominated Unsecured Notes | 6.80% due September 15, 2037 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 6.80% | 6.80% | 6.80% | 6.80%
Total debt principal | $ 191 | $ 275 | $ 191 | $ 253
U.S. Dollar Denominated Unsecured Notes | 6.75% due November 15, 2039 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 6.75% | 6.75% | 6.75% | 6.75%
Total debt principal | $ 652 | $ 938 | $ 652 | $ 862
U.S. Dollar Denominated Unsecured Notes | 4.45% due September 15, 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.45% | 4.45% | 4.45% | 4.45%
Total debt principal | $ 91 | $ 131 | $ 91 | $ 121
U.S. Dollar Denominated Unsecured Notes | 5.20% due September 15, 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.20% | 5.20% | 5.20% | 5.20%
Total debt principal | $ 27 | $ 39 | $ 27 | $ 36
U.S. Dollar Denominated Unsecured Notes | 5.40% due June 15, 2047 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.40% | 5.40% | 5.40% | 5.40%
Total debt principal | $ 569 | $ 818 | $ 569 | $ 752
U.S. Dollar Denominated Unsecured Notes | 3.75% due February 15, 2052 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.75% | 3.75% | 3.75% | 3.75%
Total debt principal | $ 750 | $ 1,079 | $ 750 | $ 992
Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 2,000 |  | $ 2,000
Canadian Dollar Denominated Unsecured Notes | 3.60% due March 10, 2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.60% | 3.60% | 3.60% | 3.60%
Total debt principal |  | $ 750 |  | $ 750
Canadian Dollar Denominated Unsecured Notes | 3.50% due February 7, 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.50% | 3.50% | 3.50% | 3.50%
Total debt principal |  | $ 1,250 |  | $ 1,250

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