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Leases (Operating Leases) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Assets and Liabilities, Lessee |  |
Right-of-use asset | $ 61 | $ 64
Lease liabilities, Current | 3 | 5
Lease liabilities, Long-term | 60 | 61
Total lease liabilities | 63 | 66
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows for operating leases | 7 | 7
Right-of-use assets obtained in exchange for lease obligations: Operating leases | $ 7 | $ 16
Weighted average remaining lease term (years) | 43 years | 39 years
Weighted average discount rate - operating leases | 3.96% | 4.07%

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