Depreciation and amortization are computed using the straight-line method, generally over the following periods:


Asset category		Period
Buildings		25 years
Building improvements		10 years
Furniture and fixtures		5 years
Leasehold improvements		Shorter of remaining lease term or 5 years
Computer equipment and related software		30 to 36 months
Production, engineering, and other equipment		Up to 5 years
Operating lease assets		Based on lease term generally up to 3 years