Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 174	$ 52
Accounts receivable, net	1,324	1,530
Intercompany receivable (payable)	0	0
Inventory	108	120
Prepaid expenses and other assets	122	140
Total current assets	1,728	1,842
Investments in subsidiaries	0	0
Goodwill	5,147	5,154
Other intangible assets, net	701	895
Operating lease right-of-use assets	663	669
Other long-term assets	30	19
Total assets	17,908	18,970
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	700	997
Accounts payable	541	454
Accrued expenses and other liabilities	675	747
Total current liabilities	1,916	2,198
Long-term debt	9,351	10,431
Deferred taxes	1,818	1,887
Operating lease liabilities	524	533
Other long-term liabilities	138	91
Total liabilities	13,747	15,140
Total stockholders’ equity (deficit)	4,161	3,830
Total liabilities and stockholders’ equity (deficit)	17,908	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	(4,058)	(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	(4,058)	(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)	(4,058)	(4,214)
Total liabilities and stockholders’ equity (deficit)	(4,058)	(4,214)
Parent | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	2,859	2,255
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	2,859	2,255
Investments in subsidiaries	1,206	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	4,182	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	0	0
Total liabilities	21	22
Total stockholders’ equity (deficit)	4,161	3,830
Total liabilities and stockholders’ equity (deficit)	4,182	3,852
URNA | Reportable Legal Entities
ASSETS
Cash and cash equivalents	26	28
Accounts receivable, net	0	0
Intercompany receivable (payable)	(2,774)	(2,130)
Inventory	97	108
Prepaid expenses and other assets	121	124
Total current assets	(2,530)	(1,870)
Investments in subsidiaries	1,776	1,636
Goodwill	4,757	4,759
Other intangible assets, net	655	833
Operating lease right-of-use assets	183	194
Other long-term assets	16	7
Total assets	13,562	14,954
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	63	66
Accounts payable	483	395
Accrued expenses and other liabilities	502	572
Total current liabilities	1,048	1,033
Long-term debt	9,332	10,402
Deferred taxes	1,697	1,768
Operating lease liabilities	141	151
Other long-term liabilities	138	91
Total liabilities	12,356	13,445
Total stockholders’ equity (deficit)	1,206	1,509
Total liabilities and stockholders’ equity (deficit)	13,562	14,954
Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	(89)	(112)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(89)	(112)
Investments in subsidiaries	1,076	1,069
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	413	403
Other long-term assets	0	0
Total assets	1,455	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	124	118
Total current liabilities	124	118
Long-term debt	6	7
Deferred taxes	0	0
Operating lease liabilities	328	323
Other long-term liabilities	0	0
Total liabilities	458	448
Total stockholders’ equity (deficit)	997	990
Total liabilities and stockholders’ equity (deficit)	1,455	1,438
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Cash and cash equivalents	148	24
Accounts receivable, net	140	171
Intercompany receivable (payable)	3	(14)
Inventory	11	12
Prepaid expenses and other assets	1	16
Total current assets	303	209
Investments in subsidiaries	0	0
Goodwill	390	395
Other intangible assets, net	46	62
Operating lease right-of-use assets	67	72
Other long-term assets	1	0
Total assets	1,582	1,580
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	3	2
Accounts payable	58	59
Accrued expenses and other liabilities	49	55
Total current liabilities	110	116
Long-term debt	13	22
Deferred taxes	100	97
Operating lease liabilities	55	59
Other long-term liabilities	0	0
Total liabilities	278	294
Total stockholders’ equity (deficit)	1,304	1,286
Total liabilities and stockholders’ equity (deficit)	1,582	1,580
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	1,184	1,359
Intercompany receivable (payable)	1	1
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	1,185	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	1,185	1,360
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	634	929
Accounts payable	0	0
Accrued expenses and other liabilities	0	2
Total current liabilities	634	931
Long-term debt	0	0
Deferred taxes	0	0
Operating lease liabilities	0	0
Other long-term liabilities	0	0
Total liabilities	634	931
Total stockholders’ equity (deficit)	551	429
Total liabilities and stockholders’ equity (deficit)	1,185	1,360
Rental equipment, net
ASSETS
Property and equipment, net	9,041	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	8,312	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	729	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	598	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	104	76
Property and equipment, net | URNA | Reportable Legal Entities
ASSETS
Property and equipment, net	393	400
Property and equipment, net | Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Property and equipment, net	55	78
Property and equipment, net | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Property and equipment, net	46	50
Property and equipment, net | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Property and equipment, net	$ 0	$ 0