Restructuring And Asset Impairment Charges (Restructuring) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	48 Months Ended		48 Months Ended		12 Months Ended				3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011 branches employees	Dec. 31, 2007 employees branches	Dec. 31, 2011 Severance costs	Dec. 31, 2011 Branch closure charges	Dec. 31, 2011 General Rentals [Member]	Dec. 31, 2010 General Rentals [Member]	Dec. 31, 2009 General Rentals [Member]	Dec. 31, 2009 Depreciation Of Rental Equipment [Member] General Rentals [Member]	Dec. 31, 2011 Non Rental Depreciation And Amortization [Member]	Dec. 31, 2009 Non Rental Depreciation And Amortization [Member] General Rentals [Member]
Restructuring Cost and Reserve [Line Items]
Entity Number of Employees		7,500	10,900
Number of branches		529	697
Restructuring and Related Cost, Cost Incurred to Date		$ 104		$ 21	$ 83
Asset Impairment Charges	$ 6					$ 4	$ 9	$ 12	$ 9	$ 3	$ 3