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Leases - Supplemental Balance Sheet Information (Details)
$ in Millions
Mar. 31, 2019
CAD ($)
Rate
Leases [Abstract]  
Operating Lease, Other assets $ 394
Operating Lease, Accounts payable and accrued liabilities 71
Operating Lease, Other long-term liabilities 315
Finance Lease, Right-of-Use Asset 179
Finance Lease, Long-term debt maturing within one year 5
Finance Lease, Long-term debt $ 150
Operating Lease, Weighted Average Remaining Lease Term 8 years
Finance Lease, Weighted Average Remaining Lease Term 5 years
Operating Lease, Weighted Average Discount Rate | Rate 3.50%
Finance Lease, Weighted Average Discount Rate | Rate 7.12%