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financial instruments - Derivative gains and losses (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Currency risk        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion) $ (250) $ (36) $ 420 $ (166)
Gain (loss) reclassified from other comprehensive income to income (effective portion) (127) (54) 230 (114)
Derivatives        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion) (250) (41) 410 (161)
Gain (loss) reclassified from other comprehensive income to income (effective portion) (126) (55) 229 (108)
Derivatives | Currency risk        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion) (250) (36) 420 (166)
Gain (loss) reclassified from other comprehensive income to income (effective portion) (127) (54) 230 (114)
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) (13) (7) 18 (15)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 5 4 7 9
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) (216) (29) 424 (151)
Gain (loss) reclassified from other comprehensive income to income (effective portion) (129) (58) 223 (123)
Spread included in fair value of derivative instruments (4) (4) 54 7
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) (21)   (22)  
Gain (loss) reclassified from other comprehensive income to income (effective portion) (3)      
Spread included in fair value of derivative instruments 2   2  
Derivatives held for hedging | Other market risk | Employee benefits expense        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion)   (5) (10) 5
Gain (loss) reclassified from other comprehensive income to income (effective portion) 1 (1) (1) 6
Derivatives held for trading | Currency risk | Financing costs        
Disclosure of detailed information about financial instruments        
Gain recognized in income on derivatives $ 3 $ 3 4 5
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