Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents		$ 200	$ 158	$ 170	$ 175
Accounts receivable, net		894	940
Intercompany receivable (payable)		0	0
Inventory		81	78
Prepaid expenses and other assets		74	122
Deferred taxes		187	248
Total current assets		1,436	1,546
Investments in subsidiaries		0	0
Goodwill		3,253	3,272
Other intangible assets, net		1,000	1,106
Other long-term assets		95	97
Total assets		12,605	12,467
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	[1]	590	618
Accounts payable		683	285
Accrued expenses and other liabilities		309	575
Total current liabilities		1,582	1,478
Long-term debt		7,820	7,434
Deferred taxes		1,696	1,692
Other long-term liabilities		55	65
Total liabilities		11,153	10,669
Temporary equity		1	2
Total stockholders’ equity (deficit)		1,451	1,796
Total liabilities and stockholders’ equity		$ 12,605	12,467
Parent
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)		144	476
Inventory		0	0
Prepaid expenses and other assets		0	0
Deferred taxes		0	0
Total current assets		144	476
Investments in subsidiaries		1,294	1,330
Goodwill		0	0
Other intangible assets, net		0	0
Other long-term assets		0	1
Total assets		1,478	1,849
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt		7	32
Accounts payable		0	0
Accrued expenses and other liabilities		0	0
Total current liabilities		7	32
Long-term debt		0	0
Deferred taxes		19	19
Other long-term liabilities		0	0
Total liabilities		26	51
Temporary equity		1	2
Total stockholders’ equity (deficit)		1,451	1,796
Total liabilities and stockholders’ equity		1,478	1,849
URNA
ASSETS
Cash and cash equivalents		4	8	26	17
Accounts receivable, net		39	37
Intercompany receivable (payable)		55	(428)
Inventory		73	69
Prepaid expenses and other assets		67	113
Deferred taxes		186	246
Total current assets		424	45
Investments in subsidiaries		1,011	1,185
Goodwill		3,000	3,000
Other intangible assets, net		923	1,014
Other long-term assets		95	96
Total assets		11,570	11,071
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt		583	38
Accounts payable		618	248
Accrued expenses and other liabilities		273	499
Total current liabilities		1,474	785
Long-term debt		7,143	7,298
Deferred taxes		1,604	1,594
Other long-term liabilities		55	64
Total liabilities		10,276	9,741
Temporary equity		0	0
Total stockholders’ equity (deficit)		1,294	1,330
Total liabilities and stockholders’ equity		$ 11,570	11,071
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)		(188)	(60)
Inventory		0	0
Prepaid expenses and other assets		0	1
Deferred taxes		0	0
Total current assets		(188)	(59)
Investments in subsidiaries		1,001	1,040
Goodwill		0	0
Other intangible assets, net		0	0
Other long-term assets		0	0
Total assets		833	1,002
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		14	19
Total current liabilities		14	19
Long-term debt		121	130
Deferred taxes		0	0
Other long-term liabilities		0	0
Total liabilities		135	149
Temporary equity		0	0
Total stockholders’ equity (deficit)		698	853
Total liabilities and stockholders’ equity		833	1,002
Non Guarantor Subsidiaries - Foreign
ASSETS
Cash and cash equivalents		196	150	144	158
Accounts receivable, net		108	144
Intercompany receivable (payable)		(126)	(109)
Inventory		8	9
Prepaid expenses and other assets		7	8
Deferred taxes		1	2
Total current assets		194	204
Investments in subsidiaries		0	0
Goodwill		253	272
Other intangible assets, net		77	92
Other long-term assets		0	0
Total assets		1,168	1,220
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt		0	0
Accounts payable		65	37
Accrued expenses and other liabilities		22	57
Total current liabilities		87	94
Long-term debt		7	6
Deferred taxes		73	79
Other long-term liabilities		0	1
Total liabilities		167	180
Temporary equity		0	0
Total stockholders’ equity (deficit)		1,001	1,040
Total liabilities and stockholders’ equity		1,168	1,220
Non Guarantor Subsidiaries - SPV
ASSETS
Cash and cash equivalents		0	0	0	0
Accounts receivable, net		747	759
Intercompany receivable (payable)		0	0
Inventory		0	0
Prepaid expenses and other assets		0	0
Deferred taxes		0	0
Total current assets		747	759
Investments in subsidiaries		0	0
Goodwill		0	0
Other intangible assets, net		0	0
Other long-term assets		0	0
Total assets		747	759
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt		0	548
Accounts payable		0	0
Accrued expenses and other liabilities		0	0
Total current liabilities		0	548
Long-term debt		549	0
Deferred taxes		0	0
Other long-term liabilities		0	0
Total liabilities		549	548
Temporary equity		0	0
Total stockholders’ equity (deficit)		198	211
Total liabilities and stockholders’ equity		$ 747	759
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		$ 252
Eliminations
ASSETS
Cash and cash equivalents		0	0	$ 0	$ 0
Accounts receivable, net		0	0
Intercompany receivable (payable)		115	121
Inventory		0	0
Prepaid expenses and other assets		0	0
Deferred taxes		0	0
Total current assets		115	121
Investments in subsidiaries		(3,306)	(3,555)
Goodwill		0	0
Other intangible assets, net		0	0
Other long-term assets		0	0
Total assets		(3,191)	(3,434)
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)		(3,191)	(3,434)
Total liabilities and stockholders’ equity		(3,191)	(3,434)
Rental equipment, net
ASSETS
Property, plant and equipment, net		6,396	6,008
Rental equipment, net | Parent
ASSETS
Property, plant and equipment, net		0	0
Rental equipment, net | URNA
ASSETS
Property, plant and equipment, net		5,794	5,399
Rental equipment, net | Guarantor Subsidiaries
ASSETS
Property, plant and equipment, net		0	0
Rental equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net		602	609
Rental equipment, net | Non Guarantor Subsidiaries - SPV
ASSETS
Property, plant and equipment, net		0	0
Rental equipment, net | Eliminations
ASSETS
Property, plant and equipment, net		0	0
Property and equipment, net
ASSETS
Property, plant and equipment, net		425	438
Property and equipment, net | Parent
ASSETS
Property, plant and equipment, net		40	42
Property and equipment, net | URNA
ASSETS
Property, plant and equipment, net		323	332
Property and equipment, net | Guarantor Subsidiaries
ASSETS
Property, plant and equipment, net		20	21
Property and equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net		42	43
Property and equipment, net | Non Guarantor Subsidiaries - SPV
ASSETS
Property, plant and equipment, net		0	0
Property and equipment, net | Eliminations
ASSETS
Property, plant and equipment, net		$ 0	$ 0

[1] As of June 30, 2015, our short-term debt primarily reflects $549 of borrowings under our accounts receivable securitization facility.