Leases - Maturities of Lease Liabilities (Details) $ in Millions	Dec. 31, 2024 CAD ($)
Finance leases
2025	$ 7
2026	14
2027	10
2028	0
2029	0
Thereafter	7
Total lease future payments	38
Imputed interest	(3)
Present value of future lease payments	35
Operating leases
2025	126
2026	109
2027	78
2028	53
2029	26
Thereafter	16
Total lease future payments	408
Imputed interest	(42)
Present value of future lease payments	$ 366