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Estimated 2015 Amortization from Accumulated Other Comprehensive Income (Detail) (CAD)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Pension benefits

Defined Benefit Plan Disclosure [Line Items]

Net actuarial loss/(gain)

191us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
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^[1]

Prior service cost

18us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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^[2]

Other post-retirement benefits

Defined Benefit Plan Disclosure [Line Items]

Net actuarial loss/(gain)

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^[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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