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Debt and Capital Structure - Committed Credit Facilities (Details) - CAD ($) $ in Millions | Sep. 30, 2021 | Aug. 18, 2021 | Jan. 01, 2021 | Dec. 31, 2020
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-Term Debt | $ 12,986 |  |  | $ 7,441
Committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | $ 6,000 |  |
Committed credit facilities, cancelled |  | 8,500 |  |
Committed credit facilities | The Arrangement |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  | $ 4,000 |
Long-Term Debt |  |  | $ 350 |
Committed Credit Facilities, Maturing August 18, 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | 2,000 |  |
Committed Credit Facilities, Maturing August 18, 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | $ 4,000 |  |

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- Definition Borrowing Facilities, Maximum Borrowing Capacity + References No definition available. + Details
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- Details
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