CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Millions, except Share data, unless otherwise specified		Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2011		$ 64	$ 1	$ 487	$ (499)	$ 0	$ 75
Balance (in shares) at Dec. 31, 2011		62,877,530	63,000,000			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		34			34
Foreign currency translation adjustments		18					18
Fixed price diesel swaps		1					1
RSC acquisition (in shares)			30,000,000
RSC acquisition				1,425
Stock compensation expense, net (1)	[1]			45
Exercise of common stock options (in shares)			2,000,000
Exercise of common stock options				17
Conversion of 1 7/8 percent Convertible Senior Subordinated Notes (in shares)			1,000,000
Conversion of 1 7/8 percent Convertible Senior Subordinated Notes				17
4 percent Convertible Senior Notes				6
Shares repurchased and retired				(16)
Repurchase of common stock (in shares)			(3,000,000)			3,000,000
Repurchase of common stock						(112)
Excess tax benefits from share-based payment arrangements, net				(4)
Balance at Sep. 30, 2012		$ 1,495	$ 1	$ 1,977	$ (465)	$ (112)	$ 94
Balance (in shares) at Sep. 30, 2012		92,589,656	93,000,000			3,000,000

[1] Includes net stock compensation expense as reported as a separate component in our condensed consolidated statements of cash flows, and net stock compensation expense included in “Restructuring charge” and "RSC merger related costs" as reported in our condensed consolidated statements of cash flows.