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Employee Future Benefits - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 CAD ($) | Dec. 31, 2022 CAD ($) age | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 CAD ($) Rate
Disclosure of defined benefit plans [line items] |  |  |  |
Weighted average duration of defined benefit obligation | 9 years 10 months 24 days |  |  |
Minimum |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Employer contribution (as percent) |  |  | 500.00% |
Maximum |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Employer contribution (as percent) |  |  | 1100.00% |
Registered | Letter of credit |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Letter of credit, posted | $ 96 | $ 96 | $ 96 | $ 96
Other |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Maximum age disabled and retired members eligible for benefits |  | 65 |  | 65

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