Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 513	$ 52
Accounts receivable, net	1,413	1,530
Intercompany receivable (payable)	0	0
Inventory	115	120
Prepaid expenses and other assets	173	140
Total current assets	2,214	1,842
Investments in subsidiaries	0	0
Goodwill	5,122	5,154
Other intangible assets, net	823	895
Operating lease right-of-use assets	666	669
Other long-term assets	21	19
Total assets	18,868	18,970
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	854	997
Accounts payable	484	454
Accrued expenses and other liabilities	658	747
Total current liabilities	1,996	2,198
Long-term debt	10,743	10,431
Deferred taxes	1,878	1,887
Operating lease liabilities	530	533
Other long-term liabilities	86	91
Total liabilities	15,233	15,140
Total stockholders’ equity (deficit)	3,635	3,830
Total liabilities and stockholders’ equity (deficit)	18,868	18,970
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	(3,670)	(4,214)
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	0	0
Other long-term assets	0	0
Total assets	(3,670)	(4,214)
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	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total stockholders’ equity (deficit)	(3,670)	(4,214)
Total liabilities and stockholders’ equity (deficit)	(3,670)	(4,214)
Parent | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	2,461	2,255
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	2,461	2,255
Investments in subsidiaries	1,093	1,509
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	0	0
Other long-term assets	13	12
Total assets	3,657	3,852
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	21	22
Operating lease liabilities	0	0
Other long-term liabilities	1	0
Total liabilities	22	22
Total stockholders’ equity (deficit)	3,635	3,830
Total liabilities and stockholders’ equity (deficit)	3,657	3,852
URNA | Reportable Legal Entities
ASSETS
Cash and cash equivalents	473	28
Accounts receivable, net	0	0
Intercompany receivable (payable)	(2,351)	(2,130)
Inventory	105	108
Prepaid expenses and other assets	158	124
Total current assets	(1,615)	(1,870)
Investments in subsidiaries	1,592	1,636
Goodwill	4,756	4,759
Other intangible assets, net	770	833
Operating lease right-of-use assets	187	194
Other long-term assets	8	7
Total assets	14,806	14,954
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	57	66
Accounts payable	437	395
Accrued expenses and other liabilities	496	572
Total current liabilities	990	1,033
Long-term debt	10,728	10,402
Deferred taxes	1,766	1,768
Operating lease liabilities	144	151
Other long-term liabilities	85	91
Total liabilities	13,713	13,445
Total stockholders’ equity (deficit)	1,093	1,509
Total liabilities and stockholders’ equity (deficit)	14,806	14,954
Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	(107)	(112)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(107)	(112)
Investments in subsidiaries	985	1,069
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	415	403
Other long-term assets	0	0
Total assets	1,364	1,438
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	118	118
Total current liabilities	118	118
Long-term debt	7	7
Deferred taxes	0	0
Operating lease liabilities	333	323
Other long-term liabilities	0	0
Total liabilities	458	448
Total stockholders’ equity (deficit)	906	990
Total liabilities and stockholders’ equity (deficit)	1,364	1,438
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Cash and cash equivalents	40	24
Accounts receivable, net	143	171
Intercompany receivable (payable)	(4)	(14)
Inventory	10	12
Prepaid expenses and other assets	15	16
Total current assets	204	209
Investments in subsidiaries	0	0
Goodwill	366	395
Other intangible assets, net	53	62
Operating lease right-of-use assets	64	72
Other long-term assets	0	0
Total assets	1,440	1,580
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	2	2
Accounts payable	47	59
Accrued expenses and other liabilities	43	55
Total current liabilities	92	116
Long-term debt	8	22
Deferred taxes	91	97
Operating lease liabilities	53	59
Other long-term liabilities	0	0
Total liabilities	244	294
Total stockholders’ equity (deficit)	1,196	1,286
Total liabilities and stockholders’ equity (deficit)	1,440	1,580
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	1,270	1,359
Intercompany receivable (payable)	1	1
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	1,271	1,360
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	0	0
Other long-term assets	0	0
Total assets	1,271	1,360
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	795	929
Accounts payable	0	0
Accrued expenses and other liabilities	1	2
Total current liabilities	796	931
Long-term debt	0	0
Deferred taxes	0	0
Operating lease liabilities	0	0
Other long-term liabilities	0	0
Total liabilities	796	931
Total stockholders’ equity (deficit)	475	429
Total liabilities and stockholders’ equity (deficit)	1,271	1,360
Rental equipment, net
ASSETS
Property and equipment, net	9,422	9,787
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	8,713	8,995
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	709	792
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	600	604
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	90	76
Property and equipment, net | URNA | Reportable Legal Entities
ASSETS
Property and equipment, net	395	400
Property and equipment, net | Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Property and equipment, net	71	78
Property and equipment, net | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Property and equipment, net	44	50
Property and equipment, net | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Property and equipment, net	$ 0	$ 0