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Financial Instruments - Financial Instrument Sensitivities (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($)
Interest rate risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase interest rate 1% | 1.00% | 1.00% |
Decrease interest rate 1% | 1.00% | 1.00% |
Increase (decrease) to net earnings | $ (46) |  | $ (5)
Increase (decrease) to net earnings | 46 |  | 5
Increase (decrease) to other comprehensive income | 0 |  | 0
Increase (decrease) to other comprehensive income | 0 |  | 0
Currency risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Weakening of the Canadian dollar by US$0.01 |  | $ 0.01 |
Strengthening of the Canadian dollar by US$0.01 |  | $ 0.01 |
Increase (decrease) to net earnings | (255) |  | (128)
Increase (decrease) to net earnings | 248 |  | 125
Increase (decrease) to other comprehensive income | 0 |  | 0
Increase (decrease) to other comprehensive income | $ 0 |  | $ 0

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