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Other long-term liabilities
 12 Months Ended
Dec. 31, 2022
Other Liabilities Disclosure [Abstract]  
Other long-term liabilities Other long-term liabilities
(in millions of Canadian dollars)20222021
Operating lease liabilities, net of current portion (Note 18)
$202 $224 
Stock-based compensation liabilities, net of current portion125 125 
Provision for environmental remediation, net of current portion(1)
71 68 
Deferred revenue, net of current portion (Note 3)
39 47 
Deferred lease and license revenue, net of current portion(2)
15 14 
Other, net of current portion68 64 
Total other long-term liabilities$520 $542 
(1) As at December 31, 2022, the aggregate provision for environmental remediation, including the current portion was $83 million (2021 – $79 million).
(2) The deferred lease and license revenue is being amortized to income on a straight-line basis over the related lease terms. Comparative figures have been reclassified to conform with current period presentation.

Environmental remediation accruals
Environmental remediation accruals cover site-specific remediation programs. The estimate of the probable costs to be incurred in the remediation of properties contaminated by past activities reflects the nature of contamination at individual sites according to typical activities and scale of operations conducted. The Company has developed remediation strategies for each property based on the nature and extent of the contamination, as well as the location of the property and surrounding areas that may be adversely affected by the presence of contaminants, considering available technologies, treatment and disposal facilities and the acceptability of site-specific plans based on the local regulatory environment. Site-specific plans range from containment and risk management of the contaminants through to the removal and treatment of the contaminants and affected soils and groundwater. The details of the estimates reflect the environmental liability at each property. Provisions for environmental remediation costs are recorded in “Other long-term liabilities”, except for the current portion which is recorded in “Accounts payable and accrued liabilities” (see Note 14). Payments are expected to be made over 10 years to 2032.
The accruals for environmental remediation represent the Company’s best estimate of its probable future obligation and include both asserted and unasserted claims, without reduction for anticipated recoveries from third parties. Although the recorded accruals include the Company’s best estimate of all probable costs, the Company’s total environmental remediation costs cannot be predicted with certainty. Accruals for environmental remediation may change from time to time as new information about previously untested sites becomes known, environmental laws and regulations evolve and advances are made in environmental remediation technology. The accruals may also vary as the courts decide legal proceedings against outside parties responsible for contamination. These potential charges, which cannot be quantified at this time, may materially affect income in the particular period in which a charge is recognized. Costs related to existing, but as yet unknown, or future contamination will be accrued in the period in which they become probable and reasonably estimable. Changes to costs are reflected as changes to “Other long-term liabilities” or “Accounts payable and accrued liabilities” on the Company's Consolidated Balance Sheets and to “Purchased services and other” within operating expenses on the Company's Consolidated Statements of Income. The amount charged to income in 2022 was $8 million (2021 – $10 million; 2020 – $10 million)