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Debt and Capital Structure - Schedule Remaining Principal Amounts of Unsecured Notes (Details) - Long-Term Debt $ in Millions, $ in Millions | Sep. 30, 2023 USD ($) | Sep. 30, 2023 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 7,140 |  | $ 8,537
Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 2,000 |  | 2,000
Unsecured Notes | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 3,802 | $ 5,140 | $ 4,827 | 6,537
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% |  |
Total debt principal | $ 133 | $ 181 | 133 | 181
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% |  |
Total debt principal | $ 373 | $ 505 | 373 | 505
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% |  |
Total debt principal | $ 183 | $ 247 | 240 | 324
2.65% due January 15, 2032 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 2.65% | 2.65% |  |
Total debt principal | $ 500 | $ 676 | 500 | 677
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% |  |
Total debt principal | $ 333 | $ 450 | 583 | 790
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% |  |
Total debt principal | $ 191 | $ 259 | 387 | 524
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% |  |
Total debt principal | $ 652 | $ 881 | 935 | 1,267
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% |  |
Total debt principal | $ 91 | $ 123 | 97 | 131
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% |  |
Total debt principal | $ 27 | $ 36 | 29 | 39
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% |  |
Total debt principal | $ 569 | $ 768 | 800 | 1,083
3.75% due February 15, 2052 | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.75% | 3.75% |  |
Total debt principal | $ 750 | $ 1,014 | $ 750 | 1,016
3.60% due March 10, 2027 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.60% | 3.60% |  |
Total debt principal |  | $ 750 |  | 750
3.50% due February 7, 2028 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term debt, interest rate | 3.50% | 3.50% |  |
Total debt principal |  | $ 1,250 |  | $ 1,250

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