Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 338	$ 312	$ 265	$ 179
Accounts receivable, net	990	920
Intercompany receivable (payable)	0	0
Inventory	78	68
Prepaid expenses and other assets	77	61
Total current assets	1,483	1,361
Investments in subsidiaries	0	0
Goodwill	3,468	3,260
Other intangible assets, net	798	742
Other long-term assets	10	6
Total assets	13,284	11,988
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	644	597
Accounts payable	692	243
Accrued expenses and other liabilities	408	344
Total current liabilities	1,744	1,184
Long-term debt	7,571	7,193
Deferred taxes	1,952	1,896
Other long-term liabilities	69	67
Total liabilities	11,336	10,340
Total stockholders’ equity (deficit)	1,948	1,648
Total liabilities and stockholders’ equity (deficit)	13,284	11,988
Rental equipment, net
ASSETS
Property, plant and equipment, net	7,076	6,189
Property and equipment, net
ASSETS
Property, plant and equipment, net	449	430
Eliminations
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	111	104
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	111	104
Investments in subsidiaries	(3,439)	(3,283)
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(3,328)	(3,179)
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)	(3,328)	(3,179)
Total liabilities and stockholders’ equity (deficit)	(3,328)	(3,179)
Eliminations | Rental equipment, net
ASSETS
Property, plant and equipment, net	0	0
Eliminations | Property and equipment, net
ASSETS
Property, plant and equipment, net	0	0
Parent | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	571	336
Inventory	0	0
Prepaid expenses and other assets	6	5
Total current assets	577	341
Investments in subsidiaries	1,354	1,292
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	3	0
Total assets	1,972	1,671
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	2	2
Deferred taxes	21	20
Other long-term liabilities	0	0
Total liabilities	24	23
Total stockholders’ equity (deficit)	1,948	1,648
Total liabilities and stockholders’ equity (deficit)	1,972	1,671
Parent | Reportable Legal Entities | Rental equipment, net
ASSETS
Property, plant and equipment, net	0	0
Parent | Reportable Legal Entities | Property and equipment, net
ASSETS
Property, plant and equipment, net	$ 38	38
URNA
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
URNA | Reportable Legal Entities
ASSETS
Cash and cash equivalents	$ 9	21	8	18
Accounts receivable, net	35	38
Intercompany receivable (payable)	(353)	(137)
Inventory	70	61
Prepaid expenses and other assets	67	51
Total current assets	(172)	34
Investments in subsidiaries	1,071	1,013
Goodwill	3,213	3,013
Other intangible assets, net	746	686
Other long-term assets	7	6
Total assets	11,760	10,787
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	26	25
Accounts payable	630	217
Accrued expenses and other liabilities	371	305
Total current liabilities	1,027	547
Long-term debt	7,452	7,076
Deferred taxes	1,858	1,805
Other long-term liabilities	69	67
Total liabilities	10,406	9,495
Total stockholders’ equity (deficit)	1,354	1,292
Total liabilities and stockholders’ equity (deficit)	11,760	10,787
URNA | Reportable Legal Entities | Rental equipment, net
ASSETS
Property, plant and equipment, net	6,555	5,709
URNA | Reportable Legal Entities | Property and equipment, net
ASSETS
Property, plant and equipment, net	$ 340	326
Guarantor Subsidiaries
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Cash and cash equivalents	$ 0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	(201)	(188)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(201)	(188)
Investments in subsidiaries	1,014	978
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	844	816
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	11	13
Total current liabilities	11	13
Long-term debt	114	111
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	125	124
Total stockholders’ equity (deficit)	719	692
Total liabilities and stockholders’ equity (deficit)	844	816
Guarantor Subsidiaries | Reportable Legal Entities | Rental equipment, net
ASSETS
Property, plant and equipment, net	0	0
Guarantor Subsidiaries | Reportable Legal Entities | Property and equipment, net
ASSETS
Property, plant and equipment, net	31	26
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Cash and cash equivalents	329	291	257	161
Accounts receivable, net	98	96
Intercompany receivable (payable)	(128)	(115)
Inventory	8	7
Prepaid expenses and other assets	4	5
Total current assets	311	284
Investments in subsidiaries	0	0
Goodwill	255	247
Other intangible assets, net	52	56
Other long-term assets	0	0
Total assets	1,179	1,107
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	2	3
Accounts payable	62	26
Accrued expenses and other liabilities	25	25
Total current liabilities	89	54
Long-term debt	3	4
Deferred taxes	73	71
Other long-term liabilities	0	0
Total liabilities	165	129
Total stockholders’ equity (deficit)	1,014	978
Total liabilities and stockholders’ equity (deficit)	1,179	1,107
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities | Rental equipment, net
ASSETS
Property, plant and equipment, net	521	480
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities | Property and equipment, net
ASSETS
Property, plant and equipment, net	40	40
Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net	857	786
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	857	786
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	857	786
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	615	568
Accounts payable	0	0
Accrued expenses and other liabilities	1	1
Total current liabilities	616	569
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	616	569
Total stockholders’ equity (deficit)	241	217
Total liabilities and stockholders’ equity (deficit)	857	786
Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities | Rental equipment, net
ASSETS
Property, plant and equipment, net	0	0
Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities | Property and equipment, net
ASSETS
Property, plant and equipment, net	0	$ 0
ABL Facility
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	1,027
ABL Facility | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	$ 456