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Schedule Of Measurement Of Lease Liabilities and Right Of Use Assets (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Cash paid for amounts included in the measurement of lease liabilities
Cash flows from operating activities, Operating leases	$ 147
Cash flows from operating activities, Finance leases	45
Cash flows from financing activities
Cash flows from financing activities, Finance leases	27
Non-cash right of use assets recorded for lease liabilities
For January 1 adoption of Leases	258	$ 298
For January 1 adoption of Leases	547
Adoption of Leases Topic (842) [Member]
Non-cash right of use assets recorded for lease liabilities
For January 1 adoption of Leases	298
For January 1 adoption of Leases
In exchange for new lease liabilities during the year	104
In exchange for new lease liabilities during the year

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