Financial Instruments - Financial Instrument Sensitivities (Details) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2025
CAD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
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 | $ (33) | $ (46) | |
| Increase (decrease) to net earnings | 33 | 46 | |
| 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 | (189) | (255) | |
| Increase (decrease) to net earnings | 184 | 248 | |
| Increase (decrease) to other comprehensive income | 0 | 0 | |
| Increase (decrease) to other comprehensive income | $ 0 | $ 0 | |