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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 | Sep. 30, 2021 USD ($) | Sep. 30, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 7,810 | $ 12,700 | $ 5,898 | $ 7,510
U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | 7,810 | 9,950 | 5,898 | 7,510
3.95% due April 15, 2022 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 246 | $ 314 | 0 | 0
Long-term debt, interest rate | 3.95% | 3.95% |  |
3.00% due August 15, 2022 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 179 | $ 227 | 500 | 637
Long-term debt, interest rate | 3.00% | 3.00% |  |
3.80% due September 15, 2023 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 115 | $ 147 | 450 | 573
Long-term debt, interest rate | 3.80% | 3.80% |  |
4.00% due April 15, 2024 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 269 | $ 342 | 0 | 0
Long-term debt, interest rate | 4.00% | 4.00% |  |
5.38% due July 15, 2025 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 666 | $ 848 | 1,000 | 1,273
Long-term debt, interest rate | 5.38% | 5.38% |  |
4.25% due April 15, 2027 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 962 | $ 1,225 | 962 | 1,225
Long-term debt, interest rate | 4.25% | 4.25% |  |
4.40% due April 15, 2029 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 750 | $ 956 | 0 | 0
Long-term debt, interest rate | 4.40% | 4.40% |  |
2.65% due January 15, 2032 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 500 | $ 637 | 0 | 0
Long-term debt, interest rate | 2.65% | 2.65% |  |
5.25% due June 15, 2037 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 583 | $ 743 | 583 | 742
Long-term debt, interest rate | 5.25% | 5.25% |  |
6.80% due September 15, 2037 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 387 | $ 493 | 0 | 0
Long-term debt, interest rate | 6.80% | 6.80% |  |
6.75% due November 15, 2039 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 1,390 | $ 1,771 | 1,390 | 1,770
Long-term debt, interest rate | 6.75% | 6.75% |  |
4.45% due September 15, 2042 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 155 | $ 198 | 155 | 198
Long-term debt, interest rate | 4.45% | 4.45% |  |
5.20% due September 15, 2043 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 58 | $ 74 | 58 | 74
Long-term debt, interest rate | 5.20% | 5.20% |  |
5.40% due June 15, 2047 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 800 | $ 1,019 | 800 | 1,018
Long-term debt, interest rate | 5.40% | 5.40% |  |
3.75% due February 15, 2052 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 750 | $ 956 | $ 0 | $ 0
Long-term debt, interest rate | 3.75% | 3.75% |  |

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