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Long-Term Debt - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2023 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayment of bank credit facilities and commercial paper, net | $ 0 | $ 1,156,000,000 |  |  | $ 6,151,000,000 |
Letters of credit and guarantees outstanding | 446,000,000 | 637,000,000 |  |  |  |
Repayment of medium-term notes | 416,000,000 | 1,498,000,000 |  |  | 0 |
Repayment of long-term debt | 0 | 0 |  |  | $ 183,000,000 |
Bank credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 5,450,000,000 |  |  |  |  |
Demand credit facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 100,000,000 |  |  |  |  |
Demand credit facility | North Sea |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Line of credit facility discontinued | £ |  |  | £ 5,000,000 |  |  |
Revolving Credit Facility Maturing February 2025 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 500,000,000 |  |  |  |  |
Revolving syndicated credit facility maturing June 2025 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 2,425,000,000 |  |  |  |  |
Revolving Syndicated Credit Facility Maturing June 2027 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 2,425,000,000 |  |  |  |  |
Non-revolving term credit facility maturing February 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayment of bank credit facilities and commercial paper, net |  | 1,150,000,000 |  |  |  |
Non-Revolving Term Credit Facility Maturing March 2022 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayment of bank credit facilities and commercial paper, net |  | 500,000,000 |  |  |  |
Revolving Term Credit Facility Maturing February 2024 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility |  | $ 500,000,000 |  |  |  |
Revolving Term Credit Facility Maturing February 2025 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | $ 500,000,000 |  |  |  |  |
Commercial Paper |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility |  |  |  |  |  | $ 2,500,000,000
Long-term debt | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 4.80% | 4.30% |  |  |  | 4.80%
Medium-term borrowings expiring August 2025 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Base shell prospectus borrowings, authorized | $ 3,000,000,000 |  |  |  |  |
1.45% Medium-term Notes |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 1.45% |  |  |  |  | 1.45%
Repayment of medium-term notes | $ 405,000,000 |  |  |  |  |
3.31% Medium-term Notes |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate |  | 3.31% |  |  |  |
Repayment of medium-term notes |  | $ 1,000,000,000 |  |  |  |
1.45% Medium-term Notes Due November 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate |  | 1.45% |  |  |  |
Repayment of medium-term notes |  | $ 95,000,000 |  |  |  |
3.55% debentures due June 3, 2024 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 3.55% | 3.55% |  |  |  | 3.55%
Repayment of medium-term notes |  | $ 169,000,000 |  |  |  |
3.42% debentures due December 1, 2026 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 3.42% | 3.42% |  |  |  | 3.42%
Repayment of medium-term notes |  | $ 159,000,000 |  |  |  |
2.50% debentures due January 17, 2028 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 2.50% | 2.50% |  |  |  | 2.50%
Repayment of medium-term notes |  | $ 75,000,000 |  |  |  |
US dollar denominated debt, unsecured |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate |  | 2.95% |  |  |  |
Base shell prospectus borrowings, authorized |  |  |  |  |  | $ 3,000,000,000
Repayment of long-term debt |  |  |  | $ 1,000,000,000 |  |

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