Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 60	$ 43
Accounts receivable, net	1,595	1,545
Intercompany receivable (payable)	0	0
Inventory	130	109
Prepaid expenses and other assets	96	64
Total current assets	1,881	1,761
Investments in subsidiaries	0	0
Goodwill	5,143	5,058
Other intangible assets, net	961	1,084
Operating lease right-of-use assets	650
Other long-term assets	19	16
Total assets	19,405	18,133
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	973	903
Accounts payable	839	536
Accrued expenses and other liabilities	831	677
Total current liabilities	2,643	2,116
Long-term debt	10,691	10,844
Deferred taxes	1,800	1,687
Operating lease liabilities	522
Other long-term liabilities	99	83
Total liabilities	15,755	14,730
Total stockholders’ equity (deficit)	3,650	3,403
Total liabilities and stockholders’ equity (deficit)	19,405	18,133
Eliminations
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	0	0
Investments in subsidiaries	(4,196)	(4,452)
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	0
Other long-term assets	0	0
Total assets	(4,196)	(4,452)
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
Operating lease liabilities	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total stockholders’ equity (deficit)	(4,196)	(4,452)
Total liabilities and stockholders’ equity (deficit)	(4,196)	(4,452)
Parent | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	2,107	1,534
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	2,107	1,534
Investments in subsidiaries	1,488	1,826
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	0
Other long-term assets	11	9
Total assets	3,671	3,426
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	0	1
Accounts payable	0	0
Accrued expenses and other liabilities	0	0
Total current liabilities	0	1
Long-term debt	0	0
Deferred taxes	21	22
Operating lease liabilities	0
Other long-term liabilities	0	0
Total liabilities	21	23
Total stockholders’ equity (deficit)	3,650	3,403
Total liabilities and stockholders’ equity (deficit)	3,671	3,426
URNA | Reportable Legal Entities
ASSETS
Cash and cash equivalents	35	1
Accounts receivable, net	0	0
Intercompany receivable (payable)	(1,980)	(1,423)
Inventory	118	96
Prepaid expenses and other assets	80	60
Total current assets	(1,747)	(1,266)
Investments in subsidiaries	1,675	1,646
Goodwill	4,760	4,661
Other intangible assets, net	895	1,004
Operating lease right-of-use assets	193
Other long-term assets	8	7
Total assets	15,543	15,424
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	46	50
Accounts payable	751	481
Accrued expenses and other liabilities	661	619
Total current liabilities	1,458	1,150
Long-term debt	10,656	10,778
Deferred taxes	1,692	1,587
Operating lease liabilities	151
Other long-term liabilities	98	83
Total liabilities	14,055	13,598
Total stockholders’ equity (deficit)	1,488	1,826
Total liabilities and stockholders’ equity (deficit)	15,543	15,424
Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	(111)	(96)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(111)	(96)
Investments in subsidiaries	1,033	980
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	387
Other long-term assets	0	0
Total assets	1,391	924
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	115	14
Total current liabilities	115	14
Long-term debt	8	9
Deferred taxes	0	0
Operating lease liabilities	313
Other long-term liabilities	0	0
Total liabilities	436	23
Total stockholders’ equity (deficit)	955	901
Total liabilities and stockholders’ equity (deficit)	1,391	924
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Cash and cash equivalents	25	42
Accounts receivable, net	159	159
Intercompany receivable (payable)	(16)	(15)
Inventory	12	13
Prepaid expenses and other assets	16	4
Total current assets	196	203
Investments in subsidiaries	0	0
Goodwill	383	397
Other intangible assets, net	66	80
Operating lease right-of-use assets	70
Other long-term assets	0	0
Total assets	1,560	1,425
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	2	2
Accounts payable	88	55
Accrued expenses and other liabilities	53	42
Total current liabilities	143	99
Long-term debt	27	57
Deferred taxes	87	78
Operating lease liabilities	58
Other long-term liabilities	1	0
Total liabilities	316	234
Total stockholders’ equity (deficit)	1,244	1,191
Total liabilities and stockholders’ equity (deficit)	1,560	1,425
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	1,436	1,386
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	1,436	1,386
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	0
Other long-term assets	0	0
Total assets	1,436	1,386
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	925	850
Accounts payable	0	0
Accrued expenses and other liabilities	2	2
Total current liabilities	927	852
Long-term debt	0	0
Deferred taxes	0	0
Operating lease liabilities	0
Other long-term liabilities	0	0
Total liabilities	927	852
Total stockholders’ equity (deficit)	509	534
Total liabilities and stockholders’ equity (deficit)	1,436	1,386
Rental equipment, net
ASSETS
Property and equipment, net	10,164	9,600
Rental equipment, net | Eliminations
ASSETS
Property and equipment, net	0	0
Rental equipment, net | Parent | Reportable Legal Entities
ASSETS
Property and equipment, net	0	0
Rental equipment, net | URNA | Reportable Legal Entities
ASSETS
Property and equipment, net	9,370	8,910
Rental equipment, net | Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Property and equipment, net	0	0
Rental equipment, net | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Property and equipment, net	794	690
Rental equipment, net | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Property and equipment, net	0	0
Property and equipment, net
ASSETS
Property and equipment, net	587	614
Property and equipment, net | Eliminations
ASSETS
Property and equipment, net	0	0
Property and equipment, net | Parent | Reportable Legal Entities
ASSETS
Property and equipment, net	65	57
Property and equipment, net | URNA | Reportable Legal Entities
ASSETS
Property and equipment, net	389	462
Property and equipment, net | Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Property and equipment, net	82	40
Property and equipment, net | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Property and equipment, net	51	55
Property and equipment, net | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Property and equipment, net	$ 0	$ 0