Leases Maturities of Lease Liabilities (Details) $ in Millions	Dec. 31, 2022 CAD ($)
Finance Leases
2023	$ 10
2024	10
2025	9
2026	9
2027	0
Thereafter	7
Total lease payments	45
Imputed interest	(7)
Present value of lease payments	38
Operating Leases
2023	75
2024	62
2025	49
2026	42
2027	28
Thereafter	37
Total lease payments	293
Imputed interest	(23)
Present value of lease payments	$ 270