Decommissioning Obligations
The Group provides for decommissioning, restoration and similar liabilities (collectively, decommissioning obligations) on its resource properties, facilities, production platforms, pipelines and other facilities based on estimates established by current legislation and industry practices. The decommissioning obligation is initially measured at fair value and capitalized to interests in resource properties or property, plant and equipment as an asset retirement cost. The liability is estimated by discounting expected future cash flows required to settle the liability using a pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the liability. The estimated future asset retirement costs are adjusted for risks such as project, physical, regulatory and timing. The estimates are reviewed periodically. Changes in the provision as a result of changes in the estimated future costs or discount rates are added to or deducted from the asset retirement cost in the period of the change. The liability accretes for the effect of time value of money until it is settled. The capitalized asset retirement cost is amortized through depreciation, depletion and amortization over the estimated useful life of the related asset. Actual asset retirement expenditures are recorded against the obligation when incurred. Any difference between the accrued liability and the actual expenditures incurred is recorded as a gain or loss in the settlement period.
