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Debt and Capital Structure - Mandatory Debt Payments (Details) - Long-Term Debt $ in Millions, $ in Millions | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 7,470 |  | $ 7,028 |
Total Debt Principal, (CAD equivalent) | 7,470 |  | 7,028 |
2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 192 |  |  |
2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 1,287 |  |  |
2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 1,250 |  |  |
2029 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 262 |  |  |
Thereafter |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 4,479 |  |  |
U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | 5,470 | $ 3,800 | 5,028 | $ 3,800
Total Debt Principal, (CAD equivalent) | 5,470 |  | 5,028 |
U.S. Dollar Denominated Unsecured Notes | 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 133 |  |
Total Debt Principal, (CAD equivalent) | 192 |  |  |
U.S. Dollar Denominated Unsecured Notes | 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 0 |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
U.S. Dollar Denominated Unsecured Notes | 2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 373 |  |
Total Debt Principal, (CAD equivalent) | 537 |  |  |
U.S. Dollar Denominated Unsecured Notes | 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 0 |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
U.S. Dollar Denominated Unsecured Notes | 2029 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 183 |  |
Total Debt Principal, (CAD equivalent) | 262 |  |  |
U.S. Dollar Denominated Unsecured Notes | Thereafter |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 3,113 |  |
Total Debt Principal, (CAD equivalent) | 4,479 |  |  |
Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | 2,000 |  | $ 2,000 |
Total Debt Principal, (CAD equivalent) | 2,000 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 750 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 1,250 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2029 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
Canadian Dollar Denominated Unsecured Notes | Thereafter |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | $ 0 |  |  |

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