Derivatives (Narrative) (Details) In Millions, unless otherwise specified		12 Months Ended					12 Months Ended										12 Months Ended
	Dec. 31, 2012 Prepaid Expenses And Other Assets [Member] USD ($)	Dec. 31, 2012 Swap [Member] USD ($) gal	Dec. 31, 2011 Swap [Member] USD ($) gal	Dec. 31, 2010 Swap [Member] USD ($) gal	Dec. 31, 2011 Swap [Member] Prepaid Expenses And Other Assets [Member] USD ($)	Dec. 31, 2011 Swap [Member] Accrued Expenses And Other Liabilities [Member] USD ($)	Dec. 31, 2012 Foreign Exchange Forward [Member] CAD	Dec. 31, 2011 Foreign Exchange Forward [Member] USD ($)	Dec. 31, 2010 Foreign Exchange Forward [Member] USD ($)	Dec. 31, 2012 Maximum [Member] Swap [Member] USD ($)	Dec. 31, 2011 Maximum [Member] Swap [Member] USD ($)	Dec. 31, 2010 Maximum [Member] Swap [Member] USD ($)	Dec. 31, 2012 Maximum [Member] Swap [Member] Prepaid Expenses And Other Assets [Member] USD ($)	Dec. 31, 2012 Maximum [Member] Swap [Member] Accrued Expenses And Other Liabilities [Member] USD ($)	Dec. 31, 2012 Maximum [Member] Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Dec. 31, 2011 Maximum [Member] Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Dec. 31, 2012 Cost of equipment rentals, excluding depreciation [Member] Designated as Hedging Instrument [Member] Swap [Member] USD ($)		Dec. 31, 2011 Cost of equipment rentals, excluding depreciation [Member] Designated as Hedging Instrument [Member] Swap [Member] USD ($)		Dec. 31, 2010 Cost of equipment rentals, excluding depreciation [Member] Designated as Hedging Instrument [Member] Swap [Member] USD ($)
Derivative [Line Items]
Derivative, nonmonetary notional amount (in gallons)		7,900,000
Derivative purchases of underlying currency (in Canadian Dollars)							90
Derivative asset, fair value, gross asset	1				0								1
Derivative liability, fair value, gross liability						1								1
Derivative accumulated other comprehensive income															1	1
Hedging activities net cash flow impact		(25)	22	11						1	1	1
Gain (loss) on hedged item								(4)	(13)								(25)	[1],[2]	(23)	[1],[2]	(11)	[1],[2]
Derivative purchases of underlying commodity (in gallons)		6,300,000	5,900,000	3,600,000
Amount of income recognized on derivative								$ 4	$ 13										$ 2	[1],[2]

[1] Amounts recognized on derivative represent the effective portion of the fixed price diesel swaps.

[2] Amounts recognized on hedged item reflect the use of 6.3 million, 5.9 million and 3.6 million gallons of diesel covered by the fixed price swaps during the years ended December 31, 2012, 2011 and 2010, respectively.