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financial instruments - Derivative gains and losses (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Currency risk    
Disclosure of detailed information about financial instruments    
Amount of gain (loss) recognized in other comprehensive income (effective portion) $ 355 $ (261)
Gain (loss) reclassified from other comprehensive income to income (effective portion) (501) 84
Derivative assets    
Disclosure of detailed information about financial instruments    
Amount of gain (loss) recognized in other comprehensive income (effective portion) 361 (264)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 505 (88)
Derivative assets | Currency risk    
Disclosure of detailed information about financial instruments    
Amount of gain (loss) recognized in other comprehensive income (effective portion) 355 (261)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 501 (84)
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) 34 (7)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 9 17
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) 266 (222)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 470 (108)
Spread included in fair value of derivative instruments (185) 40
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) 55 (32)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 22 7
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 (1) 2
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) 6 (3)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 4 (4)
Derivatives held for trading | Currency risk | Financing costs    
Disclosure of detailed information about financial instruments    
Gain (loss) on derivatives recognized in income (6) 5
Unrealized changes in virtual power purchase agreements forward element | Financing costs    
Disclosure of detailed information about financial instruments    
Gain (loss) on derivatives recognized in income (231)  
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 (22) 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 2 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 $ 0