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financial instruments - Derivative gains and losses (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Currency risk          
Disclosure of detailed information about financial instruments          
Amount of gain (loss) recognized in other comprehensive income (effective portion) $ 29 $ (166) $ 234 $ (181)  
Gain (loss) reclassified from other comprehensive income to income (effective portion) 66 (137) (202) (134)  
Derivative assets          
Disclosure of detailed information about financial instruments          
Amount of gain (loss) recognized in other comprehensive income (effective portion) 30 (165) 240 (181)  
Gain (loss) reclassified from other comprehensive income to income (effective portion) 67 (137) 204 (134)  
Derivative assets | Currency risk          
Disclosure of detailed information about financial instruments          
Amount of gain (loss) recognized in other comprehensive income (effective portion) 29 (166) 234 (181)  
Gain (loss) reclassified from other comprehensive income to income (effective portion) 66 (137) 202 (134)  
Derivatives held for hedging | Currency risk | U.S. Dollars | Financing costs          
Disclosure of detailed information about financial instruments          
Spread included in fair value of derivative instruments   1 2  
Derivatives held for hedging | Currency risk related to purchases | U.S. Dollars | Goods and services purchased          
Disclosure of detailed information about financial instruments          
Amount of gain (loss) recognized in other comprehensive income (effective portion) 5 10 15 (9)  
Gain (loss) reclassified from other comprehensive income to income (effective portion) 4 6 4 15  
Derivatives held for hedging | Currency risk related to long-term debt | U.S. Dollars | Financing costs          
Disclosure of detailed information about financial instruments          
Amount of gain (loss) recognized in other comprehensive income (effective portion) 12 (176) 182 (151)  
Gain (loss) reclassified from other comprehensive income to income (effective portion) 56 (138) 187 (138)  
Spread included in fair value of derivative instruments (23) 10 (44) (8)  
Derivatives held for hedging | Currency risk related to investment in a foreign operation | Financing costs          
Disclosure of detailed information about financial instruments          
Amount of gain (loss) recognized in other comprehensive income (effective portion) 12   37 (21)  
Gain (loss) reclassified from other comprehensive income to income (effective portion) 6 (5) 11 (11)  
Derivatives held for hedging | Currency risk related to investment in a foreign operation | U.S. Dollars | Financing costs          
Disclosure of detailed information about financial instruments          
Spread included in fair value of derivative instruments        
Derivatives held for hedging | Other market risk | Financing costs          
Disclosure of detailed information about financial instruments          
Amount of gain (loss) recognized in other comprehensive income (effective portion) 1 1 6    
Gain (loss) reclassified from other comprehensive income to income (effective portion) 1   2    
Derivatives held for trading | Currency risk | Financing costs          
Disclosure of detailed information about financial instruments          
Gain (loss) on derivatives recognized in income (5) 2 (6) 5  
Virtual power purchase agreements unrealized change in forward element | Financing costs          
Disclosure of detailed information about financial instruments          
Gain (loss) on derivatives recognized in income $ (37) $ (7) (103) $ (26)  
Cash flow hedging item (HFH) | Derivative assets | Currency risk related to long-term debt | U.S. Dollars          
Disclosure of detailed information about financial instruments          
Spread included in fair value of derivative instruments     119   $ 163
Cash flow hedging item (HFH) | Derivative assets | Currency risk related to long-term debt | European euro          
Disclosure of detailed information about financial instruments          
Spread included in fair value of derivative instruments     3   $ 3
Cash flow hedging item (HFH) | Derivatives held for hedging          
Disclosure of detailed information about financial instruments          
Ineffective portion of derivative instruments classified as cash flow hedging items     $ 0