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Long-term Debt and Capital Structure - Schedule Remaining Principal Amounts of U.S. Dollar Denominated Unsecured Notes (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | $ 5,898 |  | $ 4,998
Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | $ 7,510 |  | $ 6,757 |
3.00% Due August 15, 2022 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 500 |  | 500
Total Debt Principal, (CAD equivalent) | 637 |  | 650 |
3.80% Due September 15, 2023 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 450 |  | 450
Total Debt Principal, (CAD equivalent) | 573 |  | 585 |
5.38% due July 15, 2025 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 1,000 |  |
Total Debt Principal, (CAD equivalent) | 1,273 |  |  |
4.25% Due April 15, 2027 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 962 |  | 962
Total Debt Principal, (CAD equivalent) | 1,225 |  | 1,249 |
5.25% Due June 15, 2037 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 583 |  | 641
Total Debt Principal, (CAD equivalent) | 742 |  | 833 |
6.75% due November 15, 2039 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 1,390 |  | 1,400
Total Debt Principal, (CAD equivalent) | 1,770 |  | 1,818 |
4.45% Due September 15, 2042 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 155 |  | 155
Total Debt Principal, (CAD equivalent) | 198 |  | 202 |
5.20% Due September 15, 2043 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 58 |  | 58
Total Debt Principal, (CAD equivalent) | 74 |  | 75 |
5.40% Due June 15, 2047 [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | 800 |  | 832
Total Debt Principal, (CAD equivalent) | 1,018 |  | 1,080 |
U.S. Dollar Denominated Unsecured Notes [Member] | Long-term Borrowings [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal |  | $ 5,898 |  | $ 4,998
Total Debt Principal, (CAD equivalent) | $ 7,510 |  | $ 6,492 |

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