Financial assets and liabilities - Equity Price Exposures (Details) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Disclosure of detailed information about hedging instruments [line items] | |||||
| Net gains (losses) on change in fair value of derivatives | $ (62) | $ (43) | $ (29) | $ (42) | |
| Equity price risk | |||||
| Disclosure of detailed information about hedging instruments [line items] | |||||
| Net gains (losses) on change in fair value of derivatives | $ (62) | $ (43) | $ (29) | $ (42) | |
| Percentage of possible change in risk variable | 5.00% | 5.00% | |||
| Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact in net earnings | $ 15 | $ 15 | |||
| Forward contract | Equity price risk | |||||
| Disclosure of detailed information about hedging instruments [line items] | |||||
| Hedging instrument, liabilities | $ 219 | $ 219 | $ 187 | ||