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income taxes - Expense composition (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current income tax expense    
For the current reporting period $ 483 $ 205
Adjustments recognized in the current period for income taxes of prior periods (5) (82)
Total 478 123
Deferred income tax expense (recovery)    
Arising from the origination and reversal of temporary differences 75 361
Revaluation of deferred income tax liability to reflect future statutory income tax rates   28
Adjustments recognized in the current period for income taxes of prior periods (1) 78
Total 74 467
Income taxes $ 552 $ 590