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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, 2023 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 7,028 |  | $ 8,537
U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 3,802 | 5,028 | $ 4,800 | 6,537
Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 2,000 |  | $ 2,000
5.38% due July 15, 2025 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 176 | $ 133 | $ 181
4.25% due April 15, 2027 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 493 | $ 373 | $ 505
4.40% due April 15, 2029 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 241 | $ 240 | $ 324
2.65% due January 15, 2032 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 661 | $ 500 | $ 677
5.25% due June 15, 2037 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 441 | $ 583 | $ 790
6.80% due September 15, 2037 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 253 | $ 387 | $ 524
6.75% due November 15, 2039 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 862 | $ 935 | $ 1,267
4.45% due September 15, 2042 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 121 | $ 97 | $ 131
5.20% due September 15, 2043 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 36 | $ 29 | $ 39
5.40% due June 15, 2047 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 752 | $ 800 | $ 1,083
3.75% due February 15, 2052 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
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 | $ 992 | $ 750 | $ 1,016
3.60% due March 10, 2027 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
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
3.50% due February 7, 2028 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
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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