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Debt and Capital Structure - Schedule Remaining Principal Amounts of U.S. Dollar Denominated Unsecured Notes (Detail) $ in Millions, $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  |  | $ 7,400 |
Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 8,537 |  | $ 12,113
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 4,827 | $ 6,537 | 7,385 | 9,363
3.80% due September 15, 2023 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.80% | 3.80% |  |
Total debt principal | $ 0 | $ 0 | 115 | 146
4.00% due April 15, 2024 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.00% | 4.00% |  |
Total debt principal | $ 0 | $ 0 | 269 | 341
5.38% due July 15, 2025 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.38% | 5.38% |  |
Total debt principal | $ 133 | $ 181 | 666 | 844
4.25% due April 15, 2027 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.25% | 4.25% |  |
Total debt principal | $ 373 | $ 505 | 962 | 1,220
4.40% due April 15, 2029 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.40% | 4.40% |  |
Total debt principal | $ 240 | $ 324 | 750 | 951
2.65% due January 15, 2032 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 2.65% | 2.65% |  |
Total debt principal | $ 500 | $ 677 | 500 | 634
5.25% due June 15, 2037 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.25% | 5.25% |  |
Total debt principal | $ 583 | $ 790 | 583 | 739
6.80% due September 15, 2037 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 6.80% | 6.80% |  |
Total debt principal | $ 387 | $ 524 | 387 | 490
6.75% due November 15, 2039 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 6.75% | 6.75% |  |
Total debt principal | $ 935 | $ 1,267 | 1,390 | 1,763
4.45% due September 15, 2042 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.45% | 4.45% |  |
Total debt principal | $ 97 | $ 131 | 155 | 197
5.20% due September 15, 2043 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.20% | 5.20% |  |
Total debt principal | $ 29 | $ 39 | 58 | 73
5.40% due June 15, 2047 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.40% | 5.40% |  |
Total debt principal | $ 800 | $ 1,083 | 800 | 1,014
3.75% due February 15, 2052 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.75% | 3.75% |  |
Total debt principal | $ 750 | $ 1,016 | $ 750 | $ 951

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