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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%