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Leases (Lessee, Operating Leases and Additional Information) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Assets and Liabilities, Lessee    
Right-of-use asset $ 54 $ 58
Lease liabilities, Current 3 3
Lease liabilities, Long-term 55 59
Total lease liabilities 58 62
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows for operating leases 8 8
Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 1 $ 1
Weighted average remaining lease term (years) 44 years 44 years
Weighted average discount rate - operating leases 3.93% 3.98%