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LEASES - (Lessee) Maturities of Operating Lease Liabilities Under Previous Guidance (Details) $ in Millions	Dec. 31, 2018 CAD ($)
Leases [Abstract]
2019	$ 81
2020	78
2021	76
2022	69
2023	67
Thereafter	390
Minimum Lease Payments	$ 761

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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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