v3.19.2
income taxes - Rate reconciliations (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reconciliation of effective tax rate        
Income taxes computed at applicable statutory rates $ 147 $ 147 $ 308 $ 299
Revaluation of deferred income tax liability to reflect future income tax rates (121)   (121)  
Adjustments recognized in the current period for income taxes of prior periods (2)   (2)  
Other 7 (2) 3 (3)
Income taxes $ 31 $ 145 $ 188 $ 296
Reconciliation of effective tax rate (as a percent)        
Applicable statutory rate (as a percent) 26.70% 27.20% 26.90% 27.10%
Tax rate effect for revaluation of deferred income tax liability to reflect future income tax rates (as a percent) (22.00%)   (10.60%)  
Tax rate effect for adjustments recognized in the current period for income taxes of prior periods (as a percent) (0.30%)   (0.20%)  
Tax rate effect for other (as a percent) 1.20% (0.50%) 0.30% (0.40%)
Tax rate for Income tax expense per Consolidated statements of income and other comprehensive income (as a percent) 5.60% 26.70% 16.40% 26.70%