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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 | Jun. 30, 2022 USD ($) | Jun. 30, 2022 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 7,001 | $ 11,021 | $ 7,385 | $ 12,113
U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | 7,001 | 9,021 | 7,385 | 9,363
Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 2,000 |  | 2,750
3.80% due September 15, 2023 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 0 | $ 0 | 115 | 146
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 | $ 0 | $ 0 | 269 | 341
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 | $ 858 | 666 | 844
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 | $ 1,239 | 962 | 1,220
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 | $ 967 | 750 | 951
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 | $ 644 | 500 | 634
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 | $ 751 | 583 | 739
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 | $ 498 | 387 | 490
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 | $ 1,792 | 1,390 | 1,763
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 | $ 200 | 155 | 197
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 | 73
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 | $ 1,031 | 800 | 1,014
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 | $ 967 | $ 750 | 951
Long-term debt, interest rate | 3.75% | 3.75% |  |
3.55% due March 12, 2025 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 0 |  | 750
Long-term debt, interest rate | 3.55% | 3.55% |  |
3.60% due March 10, 2027 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 750 |  | 750
Long-term debt, interest rate | 3.60% | 3.60% |  |
3.50% due February 7, 2028 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 1,250 |  | $ 1,250
Long-term debt, interest rate | 3.50% | 3.50% |  |

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