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Schedule of Non Cancelable Operating Leases (Detail) (CAD) In Millions, unless otherwise specified	Dec. 31, 2014
Operating Leased Assets [Line Items]
Lease payments under minimum commitments, 2015	178us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent	[1]
Lease payments under minimum commitments, 2016	126us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears	[1]
Lease payments under minimum commitments, 2017	93us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears	[1]
Lease payments under minimum commitments, 2018	39us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears	[1]
Lease payments under minimum commitments, 2019	30us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears	[1]
Lease payments under minimum commitments, After 2019	28us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter	[1]
Total lease payments under minimum commitments	494us-gaap_OperatingLeasesFutureMinimumPaymentsDue	[1]
[1] Net rental cost under cancelable and non-cancelable operating leases incurred in 2014 was $315 million (2013 - $287 million, 2012 - $271 million). Related rental income was not material.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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