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Income Taxes (Detail) (CAD)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Income Tax [Line Items]      
Current income tax expense 106us-gaap_CurrentIncomeTaxExpenseBenefit 425us-gaap_CurrentIncomeTaxExpenseBenefit 593us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense 1,130us-gaap_DeferredIncomeTaxExpenseBenefit [1] 484us-gaap_DeferredIncomeTaxExpenseBenefit [1] 634us-gaap_DeferredIncomeTaxExpenseBenefit [1]
Total income tax expense 1,236us-gaap_IncomeTaxExpenseBenefit [2] 909us-gaap_IncomeTaxExpenseBenefit [2] 1,227us-gaap_IncomeTaxExpenseBenefit [2]
Statutory corporate tax rate (percent) 25.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.40%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Enacted tax rate change 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Other (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 24.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 24.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 24.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
[1] There were no material net (charges)/credits for the effect of changes in tax laws and rates included in the provisions for deferred income taxes in 2014, 2013 and 2012.
[2] Cash outflow from income taxes, plus investment credits earned, was $811 million in 2014 (2013 - $911 million, 2012 - $871 million).