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Debt and Capital Structure - Unsecured Notes (Details) - Long-Term Debt $ in Millions, $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($)
--- | --- | --- | ---
U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt principal | $ 1,000 | $ 2,600 |
5.38% due July 15, 2025 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 5.38% | 5.38% | 5.38%
4.25% due April 15, 2027 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 4.25% | 4.25% | 4.25%
4.40% due April 15, 2029 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 4.40% | 4.40% | 4.40%
5.25% due June 15, 2037 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 5.25% | 5.25% | 5.25%
6.80% due September 15, 2037 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 6.80% | 6.80% | 6.80%
6.75% due November 15, 2039 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 6.75% | 6.75% | 6.75%
4.45% due September 15, 2042 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 4.45% | 4.45% | 4.45%
5.20% due September 15, 2043 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 5.20% | 5.20% | 5.20%
5.40% due June 15, 2047 | U.S. Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term debt, interest rate | 5.40% | 5.40% | 5.40%
3.55% due March 12, 2025 | Canadian Dollar Denominated Unsecured Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total debt principal |  |  | $ 750

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