Condensed Consolidating Financial Information of Guarantor Subsidiaries CONDENSED CONSOLIDATING BALANCE SHEET (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013	Dec. 31, 2012
Condensed Financial Information Other Details [Abstract]
Stated interest rate	4.00%
ASSETS
Cash and cash equivalents	$ 170		$ 175		$ 133	$ 106
Accounts receivable, net	844		804
Intercompany receivable (payable)	0		0
Inventory	119		70
Prepaid expenses and other assets	71		53
Deferred taxes	192		260
Total current assets	1,396		1,362
Rental equipment, net	6,029		5,374
Property and equipment, net	423		421
Investments in subsidiaries	0		0
Goodwill, net	3,293	[1]	2,953	[1]
Other intangible assets, net	1,218		1,018
Other long-term assets	108		103
Total assets	12,467		11,231
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	621	[2]	604	[2]
Accounts payable	625		292
Accrued expenses and other liabilities	500		390
Total current liabilities	1,746		1,286
Long-term debt	7,394		6,569
Deferred taxes	1,440		1,459
Other long-term liabilities	80		69
Total liabilities	10,660		9,383
Temporary equity	10		20
Total stockholders’ equity (deficit)	1,797		1,828
Total liabilities and stockholders’ equity	12,467		11,231
Parent
ASSETS
Cash and cash equivalents	0		0		0	0
Accounts receivable, net	0		0
Intercompany receivable (payable)	329		308
Inventory	0		0
Prepaid expenses and other assets	0		0
Deferred taxes	0		0
Total current assets	329		308
Rental equipment, net	0		0
Property and equipment, net	48		48
Investments in subsidiaries	1,539		1,648
Goodwill, net	0		0
Other intangible assets, net	0		0
Other long-term assets	1		2
Total assets	1,917		2,006
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	87		136
Accounts payable	0		0
Accrued expenses and other liabilities	1		1
Total current liabilities	88		137
Long-term debt	0		0
Deferred taxes	22		21
Other long-term liabilities	0		0
Total liabilities	110		158
Temporary equity	10		20
Total stockholders’ equity (deficit)	1,797		1,828
Total liabilities and stockholders’ equity	1,917		2,006
URNA
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
ASSETS
Cash and cash equivalents	26		17		7	20
Accounts receivable, net	31		36
Intercompany receivable (payable)	(264)		(257)
Inventory	104		62
Prepaid expenses and other assets	56		42
Deferred taxes	190		258
Total current assets	143		158
Rental equipment, net	5,384		4,768
Property and equipment, net	310		313
Investments in subsidiaries	1,167		1,132
Goodwill, net	3,000		2,708
Other intangible assets, net	1,104		931
Other long-term assets	107		100
Total assets	11,215		10,110
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	38		38
Accounts payable	547		254
Accrued expenses and other liabilities	433		327
Total current liabilities	1,018		619
Long-term debt	7,246		6,421
Deferred taxes	1,334		1,357
Other long-term liabilities	78		65
Total liabilities	9,676		8,462
Temporary equity	0		0
Total stockholders’ equity (deficit)	1,539		1,648
Total liabilities and stockholders’ equity	11,215		10,110
Guarantor Subsidiaries
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
ASSETS
Cash and cash equivalents	0		0		0	0
Accounts receivable, net	0		0
Intercompany receivable (payable)	(57)		(51)
Inventory	0		0
Prepaid expenses and other assets	2		1
Deferred taxes	0		0
Total current assets	(55)		(50)
Rental equipment, net	0		0
Property and equipment, net	21		20
Investments in subsidiaries	1,036		997
Goodwill, net	0		0
Other intangible assets, net	0		0
Other long-term assets	0		0
Total assets	1,002		967
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	0		0
Accounts payable	0		0
Accrued expenses and other liabilities	20		25
Total current liabilities	20		25
Long-term debt	140		140
Deferred taxes	0		0
Other long-term liabilities	0		0
Total liabilities	160		165
Temporary equity	0		0
Total stockholders’ equity (deficit)	842		802
Total liabilities and stockholders’ equity	1,002		967
Non Guarantor Subsidiaries Foreign
ASSETS
Cash and cash equivalents	144		158		126	86
Accounts receivable, net	127		140
Intercompany receivable (payable)	(143)		(132)
Inventory	15		8
Prepaid expenses and other assets	13		10
Deferred taxes	2		2
Total current assets	158		186
Rental equipment, net	645		606
Property and equipment, net	44		40
Investments in subsidiaries	0		0
Goodwill, net	293		245
Other intangible assets, net	114		87
Other long-term assets	0		0
Total assets	1,254		1,164
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	0		0
Accounts payable	78		38
Accrued expenses and other liabilities	46		36
Total current liabilities	124		74
Long-term debt	8		8
Deferred taxes	84		81
Other long-term liabilities	2		4
Total liabilities	218		167
Temporary equity	0		0
Total stockholders’ equity (deficit)	1,036		997
Total liabilities and stockholders’ equity	1,254		1,164
Non Guarantor Subsidiaries SPV
ASSETS
Cash and cash equivalents	0		0		0	0
Accounts receivable, net	686		628
Intercompany receivable (payable)	0		0
Inventory	0		0
Prepaid expenses and other assets	0		0
Deferred taxes	0		0
Total current assets	686		628
Rental equipment, net	0		0
Property and equipment, net	0		0
Investments in subsidiaries	0		0
Goodwill, net	0		0
Other intangible assets, net	0		0
Other long-term assets	0		1
Total assets	686		629
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	496		430
Accounts payable	0		0
Accrued expenses and other liabilities	0		1
Total current liabilities	496		431
Long-term debt	0		0
Deferred taxes	0		0
Other long-term liabilities	0		0
Total liabilities	496		431
Temporary equity	0		0
Total stockholders’ equity (deficit)	190		198
Total liabilities and stockholders’ equity	686		629
Eliminations
ASSETS
Cash and cash equivalents	0		0		0	0
Accounts receivable, net	0		0
Intercompany receivable (payable)	135		132
Inventory	0		0
Prepaid expenses and other assets	0		0
Deferred taxes	0		0
Total current assets	135		132
Rental equipment, net	0		0
Property and equipment, net	0		0
Investments in subsidiaries	(3,742)		(3,777)
Goodwill, net	0		0
Other intangible assets, net	0		0
Other long-term assets	0		0
Total assets	(3,607)		(3,645)
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	0		0
Accounts payable	0		0
Accrued expenses and other liabilities	0		0
Total current liabilities	0		0
Long-term debt	0		0
Deferred taxes	0		0
Other long-term liabilities	0		0
Total liabilities	0		0
Temporary equity	0		0
Total stockholders’ equity (deficit)	(3,607)		(3,645)
Total liabilities and stockholders’ equity	(3,607)		(3,645)
10 1/4 percent Senior Notes
Condensed Financial Information Other Details [Abstract]
Stated interest rate	10.25%
8 1/4 percent Senior Notes
Condensed Financial Information Other Details [Abstract]
Stated interest rate	8.25%
ABL Facility, Accounts Receivable Securitization Facility, and Other Agreements | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	$ 421

[1] The total carrying amount of goodwill for all periods in the table above is reflected net of $1,557 of accumulated impairment charges, which were primarily recorded in our general rentals segment.

[2] As of June 30, 2014, our short-term debt primarily reflects $496 of borrowings under our accounts receivable securitization facility and $87 of 4 percent Convertible Senior Notes. The 4 percent Convertible Senior Notes mature in November 2015, but are reflected as short-term debt because they are redeemable at June 30, 2014.