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Debt and Capital Structure - Unsecured Notes (Details) $ in Millions, $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($)
--- | --- | --- | --- | ---
Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 2,558 |  | $ 2,150 |
3.95% due April 15, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.95% | 3.95% |  |
Total debt principal | $ 0 |  | 500 |
3.00% due August 15, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.00% | 3.00% |  |
Total debt principal | $ 0 |  | 500 |
3.80% due September 15, 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.80% | 3.80% |  |
Total debt principal | $ 115 |  | 335 |
4.00% due April 15, 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.00% | 4.00% |  |
Total debt principal | $ 269 |  | 481 |
5.38% due July 15, 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.38% | 5.38% |  |
Total debt principal | $ 533 |  | 334 |
4.25% due April 15, 2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.25% | 4.25% |  |
Total debt principal | $ 589 |  | 0 |
4.40% due April 15, 2029 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.40% | 4.40% |  |
Total debt principal | $ 510 |  | 0 |
6.75% due November 15, 2039 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 6.75% | 6.75% |  |
Total debt principal | $ 455 |  | 0 |
4.45% due September 15, 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 4.45% | 4.45% |  |
Total debt principal | $ 58 |  | 0 |
5.20% due September 15, 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 5.20% | 5.20% |  |
Total debt principal | $ 29 |  | $ 0 |
3.55% due March 12, 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.55% | 3.55% |  |
Total debt principal |  | $ 750 |  | $ 0

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