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Leases (Operating Leases) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Assets and Liabilities, Lessee    
Right-of-use asset $ 58 $ 58
Lease liabilities, Current 3 3
Lease liabilities, Long-term 59 58
Total lease liabilities 62 61
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows for operating leases 8 7
Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 1 $ 0
Weighted average remaining lease term (years) 44 years 44 years
Weighted average discount rate - operating leases 0.0398% 0.0398%