Property, net
Property, plant and equipment, including internal use software, is recorded at cost. Major improvements that extend the useful life or add functionality of property are capitalized. The gross amount of assets under capital leases is included in property, plant and equipment. Expenditures for repairs and maintenance are charged to expense as incurred. We depreciate all depreciable property using the straight-line method. Leasehold improvements are amortized over the period of lease or the life of the asset, whichever is shorter. The amortization of the assets under capital leases is included in depreciation expense. Upon retirement or disposition of property, plant and equipment, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recorded in earnings. Impairment charges related to property are recorded in Automotive cost of sales, Automotive selling, general and administrative expense or GM Financial operating and other expenses.
Special Tools
Special tools represent product-specific powertrain and non-powertrain related tools, dies, molds and other items used in the vehicle manufacturing process. Expenditures for special tools are recorded at cost and are capitalized. We amortize all non-powertrain special tools over their estimated useful lives using an accelerated amortization method. We amortize powertrain special tools over their estimated useful lives using the straight-line method. Impairment charges related to special tools are recorded in Automotive cost of sales.