Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 297	$ 179	$ 171	$ 158
Accounts receivable, net	929	930
Intercompany receivable (payable)	0	0
Inventory	72	69
Prepaid expenses and other assets	56	116
Total current assets	1,354	1,294
Investments in subsidiaries	0	0
Goodwill	3,267	3,243
Other intangible assets, net	782	905
Other long-term assets	10	10
Total assets	12,275	12,083
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	609	607
Accounts payable	409	271
Accrued expenses and other liabilities	402	355
Total current liabilities	1,420	1,233
Long-term debt	7,393	7,555
Deferred taxes	1,863	1,765
Other long-term liabilities	60	54
Total liabilities	10,736	10,607
Total stockholders’ equity (deficit)	1,539	1,476
Total liabilities and stockholders’ equity	$ 12,275	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)	229	144
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	229	144
Investments in subsidiaries	1,293	1,307
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	3	3
Total assets	1,563	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)	1,539	1,476
Total liabilities and stockholders’ equity	1,563	1,499
URNA
ASSETS
Cash and cash equivalents	20	18	16	8
Accounts receivable, net	25	41
Intercompany receivable (payable)	(29)	40
Inventory	65	62
Prepaid expenses and other assets	47	98
Total current assets	128	259
Investments in subsidiaries	1,033	958
Goodwill	3,014	3,000
Other intangible assets, net	721	838
Other long-term assets	7	7
Total assets	11,161	11,053
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	26	34
Accounts payable	378	237
Accrued expenses and other liabilities	368	314
Total current liabilities	772	585
Long-term debt	7,268	7,430
Deferred taxes	1,768	1,677
Other long-term liabilities	60	54
Total liabilities	9,868	9,746
Total stockholders’ equity (deficit)	1,293	1,307
Total liabilities and stockholders’ equity	$ 11,161	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)	(190)	(176)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(190)	(176)
Investments in subsidiaries	990	924
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	823	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	14	14
Total current liabilities	14	14
Long-term debt	114	110
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	128	124
Total stockholders’ equity (deficit)	695	644
Total liabilities and stockholders’ equity	823	768
Non Guarantor Subsidiaries - Foreign
ASSETS
Cash and cash equivalents	277	161	155	150
Accounts receivable, net	97	104
Intercompany receivable (payable)	(121)	(109)
Inventory	7	7
Prepaid expenses and other assets	9	18
Total current assets	269	181
Investments in subsidiaries	0	0
Goodwill	253	243
Other intangible assets, net	61	67
Other long-term assets	0	0
Total assets	1,126	1,066
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	3	0
Accounts payable	31	34
Accrued expenses and other liabilities	19	27
Total current liabilities	53	61
Long-term debt	8	11
Deferred taxes	75	70
Other long-term liabilities	0	0
Total liabilities	136	142
Total stockholders’ equity (deficit)	990	924
Total liabilities and stockholders’ equity	1,126	1,066
Non Guarantor Subsidiaries - SPV
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	807	785
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	807	785
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	807	785
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	579	572
Accounts payable	0	0
Accrued expenses and other liabilities	1	0
Total current liabilities	580	572
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	580	572
Total stockholders’ equity (deficit)	227	213
Total liabilities and stockholders’ equity	807	785
Eliminations
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net	0	0
Intercompany receivable (payable)	111	101
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	111	101
Investments in subsidiaries	(3,316)	(3,189)
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(3,205)	(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)	(3,205)	(3,088)
Total liabilities and stockholders’ equity	(3,205)	(3,088)
Rental equipment, net
ASSETS
Property, plant and equipment, net	6,427	6,186
Rental equipment, net | Parent
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | URNA
ASSETS
Property, plant and equipment, net	5,929	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	498	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	435	445
Property and equipment, net | Parent
ASSETS
Property, plant and equipment, net	38	45
Property and equipment, net | URNA
ASSETS
Property, plant and equipment, net	329	334
Property and equipment, net | Guarantor Subsidiaries
ASSETS
Property, plant and equipment, net	23	20
Property and equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net	45	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
ABL Facility
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	561
ABL Facility | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	$ 332
8 1/4 percent Senior Notes
Condensed Financial Information Other Details [Abstract]
Stated interest rate	8.25%	8.25%