Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEETS (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 312	$ 179	$ 158	$ 175
Accounts receivable, net	920	930
Intercompany receivable (payable)	0	0
Inventory	68	69
Prepaid expenses and other assets	61	116
Total current assets	1,361	1,294
Investments in subsidiaries	0	0
Goodwill	3,260	3,243	3,272	2,953
Other intangible assets, net	742	905
Other long-term assets	6	10
Total assets	11,988	12,083	12,129
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt and current maturities of long-term debt	597	607
Accounts payable	243	271
Accrued expenses and other liabilities	344	355
Total current liabilities	1,184	1,233
Long-term debt	7,193	7,555
Deferred taxes	1,896	1,765
Other long-term liabilities	67	54
Total liabilities	10,340	10,607
Total stockholders’ equity (deficit)	1,648	1,476
Total liabilities and stockholders’ equity	11,988	12,083
Eliminations
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	104	101
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	104	101
Investments in subsidiaries	(3,283)	(3,189)
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(3,179)	(3,088)
LIABILITIES AND STOCKHOLDERS’ EQUITY
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)	(3,179)	(3,088)
Total liabilities and stockholders’ equity	(3,179)	(3,088)
Parent
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	336	144
Inventory	0	0
Prepaid expenses and other assets	5	0
Total current assets	341	144
Investments in subsidiaries	1,292	1,307
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	3
Total assets	1,671	1,499
LIABILITIES AND STOCKHOLDERS’ EQUITY
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	2	4
Deferred taxes	20	18
Other long-term liabilities	0	0
Total liabilities	23	23
Total stockholders’ equity (deficit)	1,648	1,476
Total liabilities and stockholders’ equity	$ 1,671	1,499
URNA
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
ASSETS
Cash and cash equivalents	$ 21	18	8	17
Accounts receivable, net	38	41
Intercompany receivable (payable)	(137)	40
Inventory	61	62
Prepaid expenses and other assets	51	98
Total current assets	34	259
Investments in subsidiaries	1,013	958
Goodwill	3,013	3,000
Other intangible assets, net	686	838
Other long-term assets	6	7
Total assets	10,787	11,053
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt and current maturities of long-term debt	25	34
Accounts payable	217	237
Accrued expenses and other liabilities	305	314
Total current liabilities	547	585
Long-term debt	7,076	7,430
Deferred taxes	1,805	1,677
Other long-term liabilities	67	54
Total liabilities	9,495	9,746
Total stockholders’ equity (deficit)	1,292	1,307
Total liabilities and stockholders’ equity	$ 10,787	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)	(188)	(176)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(188)	(176)
Investments in subsidiaries	978	924
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	816	768
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt and current maturities of long-term debt	0	0
Accounts payable	0	0
Accrued expenses and other liabilities	13	14
Total current liabilities	13	14
Long-term debt	111	110
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	124	124
Total stockholders’ equity (deficit)	692	644
Total liabilities and stockholders’ equity	816	768
Non Guarantor Subsidiaries - Foreign
ASSETS
Cash and cash equivalents	291	161	150	158
Accounts receivable, net	96	104
Intercompany receivable (payable)	(115)	(109)
Inventory	7	7
Prepaid expenses and other assets	5	18
Total current assets	284	181
Investments in subsidiaries	0	0
Goodwill	247	243
Other intangible assets, net	56	67
Other long-term assets	0	0
Total assets	1,107	1,066
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt and current maturities of long-term debt	3	0
Accounts payable	26	34
Accrued expenses and other liabilities	25	27
Total current liabilities	54	61
Long-term debt	4	11
Deferred taxes	71	70
Other long-term liabilities	0	0
Total liabilities	129	142
Total stockholders’ equity (deficit)	978	924
Total liabilities and stockholders’ equity	1,107	1,066
Non Guarantor Subsidiaries - SPV
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net	786	785
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	786	785
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	786	785
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt and current maturities of long-term debt	568	572
Accounts payable	0	0
Accrued expenses and other liabilities	1	0
Total current liabilities	569	572
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	569	572
Total stockholders’ equity (deficit)	217	213
Total liabilities and stockholders’ equity	$ 786	$ 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	$ 713
ABL Facility, Accounts Receivable Securitization Facility, and Other Agreements | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	377
Rental equipment, net
ASSETS
Property, plant and equipment, net	6,189	$ 6,186
Rental equipment, net | Eliminations
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | Parent
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | URNA
ASSETS
Property, plant and equipment, net	5,709	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	480	529
Rental equipment, net | Non Guarantor Subsidiaries - SPV
ASSETS
Property, plant and equipment, net	0	0
Property and equipment, net
ASSETS
Property, plant and equipment, net	430	445
Property and equipment, net | Eliminations
ASSETS
Property, plant and equipment, net	0	0
Property and equipment, net | Parent
ASSETS
Property, plant and equipment, net	38	45
Property and equipment, net | URNA
ASSETS
Property, plant and equipment, net	326	334
Property and equipment, net | Guarantor Subsidiaries
ASSETS
Property, plant and equipment, net	26	20
Property and equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net	40	46
Property and equipment, net | Non Guarantor Subsidiaries - SPV
ASSETS
Property, plant and equipment, net	$ 0	$ 0