Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 219	$ 179	$ 257	$ 158
Accounts receivable, net	833	930
Intercompany receivable (payable)	0	0
Inventory	74	69
Prepaid expenses and other assets	56	116
Total current assets	1,182	1,294
Investments in subsidiaries	0	0
Goodwill	3,262	3,243
Other intangible assets, net	864	905
Other long-term assets	9	10
Total assets	11,784	12,083
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	550	607
Accounts payable	330	271
Accrued expenses and other liabilities	349	355
Total current liabilities	1,229	1,233
Long-term debt	7,203	7,555
Deferred taxes	1,797	1,765
Other long-term liabilities	54	54
Total liabilities	10,283	10,607
Total stockholders’ equity (deficit)	1,501	1,476
Total liabilities and stockholders’ equity	$ 11,784	12,083
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)	266	144
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	266	144
Investments in subsidiaries	1,215	1,307
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	2	3
Total assets	1,525	1,499
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	1	1
Accounts payable	0	0
Accrued expenses and other liabilities	0	0
Total current liabilities	1	1
Long-term debt	3	4
Deferred taxes	20	18
Other long-term liabilities	0	0
Total liabilities	24	23
Total stockholders’ equity (deficit)	1,501	1,476
Total liabilities and stockholders’ equity	1,525	1,499
URNA
ASSETS
Cash and cash equivalents	4	18	58	8
Accounts receivable, net	43	41
Intercompany receivable (payable)	(72)	40
Inventory	66	62
Prepaid expenses and other assets	41	98
Total current assets	82	259
Investments in subsidiaries	983	958
Goodwill	3,007	3,000
Other intangible assets, net	796	838
Other long-term assets	7	7
Total assets	10,691	11,053
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	30	34
Accounts payable	300	237
Accrued expenses and other liabilities	314	314
Total current liabilities	644	585
Long-term debt	7,075	7,430
Deferred taxes	1,703	1,677
Other long-term liabilities	54	54
Total liabilities	9,476	9,746
Total stockholders’ equity (deficit)	1,215	1,307
Total liabilities and stockholders’ equity	$ 10,691	11,053
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)	(187)	(176)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(187)	(176)
Investments in subsidiaries	986	924
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	819	768
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	12	14
Total current liabilities	12	14
Long-term debt	116	110
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	128	124
Total stockholders’ equity (deficit)	691	644
Total liabilities and stockholders’ equity	819	768
Non Guarantor Subsidiaries - Foreign
ASSETS
Cash and cash equivalents	215	161	199	150
Accounts receivable, net	90	104
Intercompany receivable (payable)	(116)	(109)
Inventory	8	7
Prepaid expenses and other assets	15	18
Total current assets	212	181
Investments in subsidiaries	0	0
Goodwill	255	243
Other intangible assets, net	68	67
Other long-term assets	0	0
Total assets	1,124	1,066
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	3	0
Accounts payable	30	34
Accrued expenses and other liabilities	22	27
Total current liabilities	55	61
Long-term debt	9	11
Deferred taxes	74	70
Other long-term liabilities	0	0
Total liabilities	138	142
Total stockholders’ equity (deficit)	986	924
Total liabilities and stockholders’ equity	1,124	1,066
Non Guarantor Subsidiaries - SPV
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	700	785
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	700	785
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	700	785
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	516	572
Accounts payable	0	0
Accrued expenses and other liabilities	1	0
Total current liabilities	517	572
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	517	572
Total stockholders’ equity (deficit)	183	213
Total liabilities and stockholders’ equity	$ 700	$ 785
8 1/4 percent Senior Notes
Condensed Financial Information Other Details [Abstract]
Stated interest rate	8.25%	8.25%
ABL Facility, Accounts Receivable Securitization Facility, and Other Agreements
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	$ 566
ABL Facility, Accounts Receivable Securitization Facility, and Other Agreements | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	300
Eliminations
ASSETS
Cash and cash equivalents	0	$ 0	$ 0	$ 0
Accounts receivable, net	0	0
Intercompany receivable (payable)	109	101
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	109	101
Investments in subsidiaries	(3,184)	(3,189)
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(3,075)	(3,088)
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
Total stockholders’ equity (deficit)	(3,075)	(3,088)
Total liabilities and stockholders’ equity	(3,075)	(3,088)
Rental equipment, net
ASSETS
Property, plant and equipment, net	6,025	6,186
Rental equipment, net | Parent
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | URNA
ASSETS
Property, plant and equipment, net	5,484	5,657
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	541	529
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	442	445
Property and equipment, net | Parent
ASSETS
Property, plant and equipment, net	42	45
Property and equipment, net | URNA
ASSETS
Property, plant and equipment, net	332	334
Property and equipment, net | Guarantor Subsidiaries
ASSETS
Property, plant and equipment, net	20	20
Property and equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net	48	46
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