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Debt and Capital Structure - Schedule Remaining Principal Amounts of Canadian Dollar Denominated Unsecured Notes (Details) - Long-Term Debt $ in Millions, $ in Millions | Sep. 30, 2021 USD ($) | Sep. 30, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal | $ 7,810 | $ 12,700 | $ 5,898 | $ 7,510
Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | 2,750 |  | 0
3.55% due March 12, 2025 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 750 |  | 0
Long-term debt, interest rate | 3.55% | 3.55% |  |
3.60% due March 10, 2027 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 750 |  | 0
Long-term debt, interest rate | 3.60% | 3.60% |  |
3.50% due February 7, 2028 | Canadian Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  | $ 1,250 |  | $ 0
Long-term debt, interest rate | 3.50% | 3.50% |  |

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