Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 324	$ 312	$ 297	$ 179
Accounts receivable, net	1,151	920
Intercompany receivable (payable)	0	0
Inventory	82	68
Prepaid expenses and other assets	82	61
Total current assets	1,639	1,361
Rental equipment, net	7,391	6,189
Property and equipment, net	451	430
Investments in subsidiaries	0	0
Goodwill	3,493	3,260
Other intangible assets, net	759	742
Other long-term assets	11	6
Total assets	13,744	11,988
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	694	597
Accounts payable	612	243
Accrued expenses and other liabilities	467	344
Total current liabilities	1,773	1,184
Long-term debt	7,677	7,193
Deferred taxes	2,012	1,896
Other long-term liabilities	71	67
Total liabilities	11,533	10,340
Total stockholders’ equity (deficit)	2,211	1,648
Total liabilities and stockholders’ equity (deficit)	13,744	11,988
Eliminations
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	116	104
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	116	104
Rental equipment, net	0	0
Property and equipment, net	0	0
Investments in subsidiaries	(3,768)	(3,283)
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(3,652)	(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)	(3,652)	(3,179)
Total liabilities and stockholders’ equity (deficit)	(3,652)	(3,179)
Parent | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	698	336
Inventory	0	0
Prepaid expenses and other assets	6	5
Total current assets	704	341
Rental equipment, net	0	0
Property and equipment, net	38	38
Investments in subsidiaries	1,488	1,292
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	4	0
Total assets	2,234	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	1	2
Deferred taxes	21	20
Other long-term liabilities	0	0
Total liabilities	23	23
Total stockholders’ equity (deficit)	2,211	1,648
Total liabilities and stockholders’ equity (deficit)	$ 2,234	1,671
URNA
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
URNA | Reportable Legal Entities
ASSETS
Cash and cash equivalents	$ 23	21	20	18
Accounts receivable, net	39	38
Intercompany receivable (payable)	(481)	(137)
Inventory	74	61
Prepaid expenses and other assets	74	51
Total current assets	(271)	34
Rental equipment, net	6,819	5,709
Property and equipment, net	338	326
Investments in subsidiaries	1,206	1,013
Goodwill	3,226	3,013
Other intangible assets, net	709	686
Other long-term assets	7	6
Total assets	12,034	10,787
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	25	25
Accounts payable	564	217
Accrued expenses and other liabilities	415	305
Total current liabilities	1,004	547
Long-term debt	7,555	7,076
Deferred taxes	1,916	1,805
Other long-term liabilities	71	67
Total liabilities	10,546	9,495
Total stockholders’ equity (deficit)	1,488	1,292
Total liabilities and stockholders’ equity (deficit)	$ 12,034	10,787
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)	(204)	(188)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(204)	(188)
Rental equipment, net	0	0
Property and equipment, net	33	26
Investments in subsidiaries	1,074	978
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	903	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	17	13
Total current liabilities	17	13
Long-term debt	118	111
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	135	124
Total stockholders’ equity (deficit)	768	692
Total liabilities and stockholders’ equity (deficit)	903	816
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Cash and cash equivalents	301	291	277	161
Accounts receivable, net	123	96
Intercompany receivable (payable)	(129)	(115)
Inventory	8	7
Prepaid expenses and other assets	2	5
Total current assets	305	284
Rental equipment, net	572	480
Property and equipment, net	42	40
Investments in subsidiaries	0	0
Goodwill	267	247
Other intangible assets, net	50	56
Other long-term assets	0	0
Total assets	1,236	1,107
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	2	3
Accounts payable	48	26
Accrued expenses and other liabilities	34	25
Total current liabilities	84	54
Long-term debt	3	4
Deferred taxes	75	71
Other long-term liabilities	0	0
Total liabilities	162	129
Total stockholders’ equity (deficit)	1,074	978
Total liabilities and stockholders’ equity (deficit)	1,236	1,107
Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net	989	786
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	989	786
Rental equipment, net	0	0
Property and equipment, net	0	0
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	989	786
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	666	568
Accounts payable	0	0
Accrued expenses and other liabilities	1	1
Total current liabilities	667	569
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	667	569
Total stockholders’ equity (deficit)	322	217
Total liabilities and stockholders’ equity (deficit)	989	$ 786
ABL Facility
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	1,234
ABL Facility | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	$ 536
Senior notes | 7 5/8 percent Senior Notes
Condensed Financial Information Other Details [Abstract]
Stated interest rate	7.625%
Senior notes | 5 3/4 percent Senior Notes due 2024
Condensed Financial Information Other Details [Abstract]
Stated interest rate	5.75%