Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Schedule of estimated useful lives of assets based on which provisions for depreciation and amortization are computed on a straight-line basis

Useful lives are as follows:

Buildings	3 to 50 years
Furniture and fixtures	1 to 15 years
Capitalized internal use software	1 to 15 years
Service cars and service equipment	1 to 13 years
Other intangible assets	3 to 20 years
Leasehold improvements	The shorter of their economic lives or the lease term

Schedule of estimated useful lives of revenue-earning assets

Revenue Earning Equipment

Revenue earning equipment is stated at cost, net of related discounts. Useful lives are as follows:

Cars	4 to 28 months
Other equipment	24 to 108 months