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Debt and Capital Structure - Mandatory Debt Payments (Details) $ in Millions, $ in Millions | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 7,400 |  | $ 5,900
Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 12,113 | 7,385 | $ 7,510 | 5,898
Total Debt Principal, (CAD equivalent) | 12,113 |  | 7,510 |
2023 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 146 |  |  |
2024 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 341 |  |  |
2025 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 1,594 |  |  |
Thereafter | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 10,032 |  |  |
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | 9,363 | 7,385 | 7,510 | $ 5,898
Total Debt Principal, (CAD equivalent) | 9,363 |  | 7,510 |
U.S. Dollar Denominated Unsecured Notes | 2023 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 115 |  |
Total Debt Principal, (CAD equivalent) | 146 |  |  |
U.S. Dollar Denominated Unsecured Notes | 2024 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 269 |  |
Total Debt Principal, (CAD equivalent) | 341 |  |  |
U.S. Dollar Denominated Unsecured Notes | 2025 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 666 |  |
Total Debt Principal, (CAD equivalent) | 844 |  |  |
U.S. Dollar Denominated Unsecured Notes | Thereafter | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 6,335 |  |
Total Debt Principal, (CAD equivalent) | 8,032 |  |  |
Canadian Dollar Denominated Unsecured Notes | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | 2,750 |  | $ 0 |
Total Debt Principal, (CAD equivalent) | 2,750 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2023 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2024 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 0 |  |  |
Canadian Dollar Denominated Unsecured Notes | 2025 | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 750 |  |  |
Canadian Dollar Denominated Unsecured Notes | Thereafter | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | $ 2,000 |  |  |

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