Financial Instruments - Counterparty Credit Risk Management Narrative (Details) $ in Millions |
Dec. 31, 2025
CAD ($)
customer
|
Dec. 31, 2024
CAD ($)
customer
|
Dec. 31, 2023
CAD ($)
customer
|
|---|---|---|---|
| Disclosure of detailed information about financial instruments [line items] | |||
| Number of customers, major international energy companies with investment grade ratings | customer | 2 | 1 | 3 |
| Expected credit loss rate | 2.00% | 2.00% | |
| Derivative financial asset (liability), net | $ (65) | $ 5 | $ 9 |
| Credit risk | |||
| Disclosure of detailed information about financial instruments [line items] | |||
| Derivative financial asset (liability), net | $ 0 | $ 11 |