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Estimated 2015 Amortization from Accumulated Other Comprehensive Income (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Pension benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss/(gain) | 191 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | [1]
Prior service cost | 18 us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | [2]
Other post-retirement benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net actuarial loss/(gain) | 12 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | [1]
[1] | The company amortizes the net balance of actuarial loss/(gain) as a component of net periodic benefit cost over the average remaining service period of active plan participants.
[2] | The company amortizes prior service cost on a straight-line basis.

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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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