Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 265	$ 179	$ 200	$ 158
Accounts receivable, net	867	930
Intercompany receivable (payable)	0	0
Inventory	71	69
Prepaid expenses and other assets	61	116
Total current assets	1,264	1,294
Investments in subsidiaries	0	0
Goodwill	3,259	3,243
Other intangible assets, net	825	905
Other long-term assets	10	10
Total assets	12,120	12,083
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	576	607
Accounts payable	609	271
Accrued expenses and other liabilities	323	355
Total current liabilities	1,508	1,233
Long-term debt	7,265	7,555
Deferred taxes	1,790	1,765
Other long-term liabilities	55	54
Total liabilities	10,618	10,607
Total stockholders’ equity (deficit)	1,502	1,476
Total liabilities and stockholders’ equity	$ 12,120	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)	252	144
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	252	144
Investments in subsidiaries	1,231	1,307
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	3	3
Total assets	1,526	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)	1,502	1,476
Total liabilities and stockholders’ equity	1,526	1,499
URNA
ASSETS
Cash and cash equivalents	8	18	4	8
Accounts receivable, net	37	41
Intercompany receivable (payable)	(49)	40
Inventory	64	62
Prepaid expenses and other assets	48	98
Total current assets	108	259
Investments in subsidiaries	997	958
Goodwill	3,004	3,000
Other intangible assets, net	760	838
Other long-term assets	7	7
Total assets	11,012	11,053
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	28	34
Accounts payable	574	237
Accrued expenses and other liabilities	290	314
Total current liabilities	892	585
Long-term debt	7,138	7,430
Deferred taxes	1,696	1,677
Other long-term liabilities	55	54
Total liabilities	9,781	9,746
Total stockholders’ equity (deficit)	1,231	1,307
Total liabilities and stockholders’ equity	$ 11,012	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)	(189)	(176)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(189)	(176)
Investments in subsidiaries	988	924
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	820	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	13	14
Total current liabilities	13	14
Long-term debt	115	110
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	128	124
Total stockholders’ equity (deficit)	692	644
Total liabilities and stockholders’ equity	820	768
Non Guarantor Subsidiaries - Foreign
ASSETS
Cash and cash equivalents	257	161	196	150
Accounts receivable, net	91	104
Intercompany receivable (payable)	(124)	(109)
Inventory	7	7
Prepaid expenses and other assets	13	18
Total current assets	244	181
Investments in subsidiaries	0	0
Goodwill	255	243
Other intangible assets, net	65	67
Other long-term assets	0	0
Total assets	1,129	1,066
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	3	0
Accounts payable	35	34
Accrued expenses and other liabilities	20	27
Total current liabilities	58	61
Long-term debt	9	11
Deferred taxes	74	70
Other long-term liabilities	0	0
Total liabilities	141	142
Total stockholders’ equity (deficit)	988	924
Total liabilities and stockholders’ equity	1,129	1,066
Non Guarantor Subsidiaries - SPV
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	739	785
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	739	785
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	739	785
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	544	572
Accounts payable	0	0
Accrued expenses and other liabilities	0	0
Total current liabilities	544	572
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	544	572
Total stockholders’ equity (deficit)	195	213
Total liabilities and stockholders’ equity	739	785
Eliminations
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net	0	0
Intercompany receivable (payable)	110	101
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	110	101
Investments in subsidiaries	(3,216)	(3,189)
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(3,106)	(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)	(3,106)	(3,088)
Total liabilities and stockholders’ equity	(3,106)	(3,088)
Rental equipment, net
ASSETS
Property, plant and equipment, net	6,325	6,186
Rental equipment, net | Parent
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | URNA
ASSETS
Property, plant and equipment, net	5,807	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	518	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	437	445
Property and equipment, net | Parent
ASSETS
Property, plant and equipment, net	40	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	21	20
Property and equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net	47	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	564
ABL Facility | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	$ 312
8 1/4 percent Senior Notes
Condensed Financial Information Other Details [Abstract]
Stated interest rate	8.25%	8.25%