LEASES - Lease Commitments (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Operating leases
2025	$ 148
2026	134
2027	123
2028	97
2029	65
Thereafter	685
Total undiscounted lease payments	1,252
Less imputed interest	(393)
Total	859	$ 750
Finance leases
2025	31
2026	30
2027	23
2028	23
2029	22
Thereafter	531
Total undiscounted lease payments	660
Less imputed interest	(344)
Total finance lease liabilities	$ 316	$ 283