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financial instruments - Derivative gains and losses (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Currency risk        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion) $ 21 $ (29) $ 77 $ (50)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 52 (50) 114 (60)
Other market risk        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion) 8 9 (1) 9
Gain (loss) reclassified from other comprehensive income to income (effective portion) 5 4 2 5
Derivatives        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion) 29 (20) 76 (41)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 57 (46) 116 (55)
Derivatives | Currency risk        
Disclosure of detailed information about financial instruments        
Amount of gain (loss) recognized in other comprehensive income (effective portion) 21 (29) 77 (50)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 52 (50) 114 (60)
Derivatives held for hedging        
Disclosure of detailed information about financial instruments        
Ineffective portion of derivative instruments classified as cash flow hedging items     0 0
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) 6 (10) 19 (12)
Gain (loss) reclassified from other comprehensive income to income (effective portion) (1) 4 (6) 5
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) 15 (19) 58 (38)
Gain (loss) reclassified from other comprehensive income to income (effective portion) 53 (54) 120 (65)
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) 8 9 (1) 9
Gain (loss) reclassified from other comprehensive income to income (effective portion) 5 4 $ 2 5
Derivatives held for trading | Currency risk | Financing costs        
Disclosure of detailed information about financial instruments        
Gain (loss) recognized in income on derivatives $ 1 $ 2   $ 4