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Leases (Operating Leases) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
Assets and Liabilities, Lessee  
Right-of-use asset $ 64
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets, Miscellaneous, Noncurrent
Lease liabilities, Current $ 5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current
Lease liabilities, Long-term $ 61
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent
Total lease liabilities $ 66
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows for operating leases 7
Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 16
Weighted average remaining lease term (years) 39 years
Weighted average discount rate - operating leases 4.07%