Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 127	$ 52
Accounts receivable, net	1,226	1,530
Intercompany receivable (payable)	0	0
Inventory	107	120
Prepaid expenses and other assets	162	140
Total current assets	1,622	1,842
Investments in subsidiaries	0	0
Goodwill	5,135	5,154
Other intangible assets, net	761	895
Operating lease right-of-use assets	666	669
Other long-term assets	21	19
Total assets	17,900	18,970
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	806	997
Accounts payable	316	454
Accrued expenses and other liabilities	799	747
Total current liabilities	1,921	2,198
Long-term debt	9,599	10,431
Deferred taxes	1,820	1,887
Operating lease liabilities	532	533
Other long-term liabilities	121	91
Total liabilities	13,993	15,140
Total stockholders’ equity (deficit)	3,907	3,830
Total liabilities and stockholders’ equity (deficit)	17,900	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	(3,672)	(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	(3,672)	(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)	(3,672)	(4,214)
Total liabilities and stockholders’ equity (deficit)	(3,672)	(4,214)
Parent | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	2,684	2,255
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	2,684	2,255
Investments in subsidiaries	1,125	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	3,929	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	22	22
Operating lease liabilities	0	0
Other long-term liabilities	0	0
Total liabilities	22	22
Total stockholders’ equity (deficit)	3,907	3,830
Total liabilities and stockholders’ equity (deficit)	3,929	3,852
URNA | Reportable Legal Entities
ASSETS
Cash and cash equivalents	36	28
Accounts receivable, net	0	0
Intercompany receivable (payable)	(2,577)	(2,130)
Inventory	97	108
Prepaid expenses and other assets	135	124
Total current assets	(2,309)	(1,870)
Investments in subsidiaries	1,524	1,636
Goodwill	4,756	4,759
Other intangible assets, net	712	833
Operating lease right-of-use assets	182	194
Other long-term assets	8	7
Total assets	13,649	14,954
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	61	66
Accounts payable	280	395
Accrued expenses and other liabilities	632	572
Total current liabilities	973	1,033
Long-term debt	9,583	10,402
Deferred taxes	1,703	1,768
Operating lease liabilities	144	151
Other long-term liabilities	121	91
Total liabilities	12,524	13,445
Total stockholders’ equity (deficit)	1,125	1,509
Total liabilities and stockholders’ equity (deficit)	13,649	14,954
Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	(99)	(112)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(99)	(112)
Investments in subsidiaries	1,023	1,069
Goodwill	0	0
Other intangible assets, net	0	0
Operating lease right-of-use assets	418	403
Other long-term assets	0	0
Total assets	1,406	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	121	118
Total current liabilities	121	118
Long-term debt	7	7
Deferred taxes	0	0
Operating lease liabilities	334	323
Other long-term liabilities	0	0
Total liabilities	462	448
Total stockholders’ equity (deficit)	944	990
Total liabilities and stockholders’ equity (deficit)	1,406	1,438
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Cash and cash equivalents	91	24
Accounts receivable, net	119	171
Intercompany receivable (payable)	(9)	(14)
Inventory	10	12
Prepaid expenses and other assets	27	16
Total current assets	238	209
Investments in subsidiaries	0	0
Goodwill	379	395
Other intangible assets, net	49	62
Operating lease right-of-use assets	66	72
Other long-term assets	0	0
Total assets	1,480	1,580
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	2	2
Accounts payable	36	59
Accrued expenses and other liabilities	45	55
Total current liabilities	83	116
Long-term debt	9	22
Deferred taxes	95	97
Operating lease liabilities	54	59
Other long-term liabilities	0	0
Total liabilities	241	294
Total stockholders’ equity (deficit)	1,239	1,286
Total liabilities and stockholders’ equity (deficit)	1,480	1,580
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Cash and cash equivalents	0	0
Accounts receivable, net	1,107	1,359
Intercompany receivable (payable)	1	1
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	1,108	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	1,108	1,360
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	743	929
Accounts payable	0	0
Accrued expenses and other liabilities	1	2
Total current liabilities	744	931
Long-term debt	0	0
Deferred taxes	0	0
Operating lease liabilities	0	0
Other long-term liabilities	0	0
Total liabilities	744	931
Total stockholders’ equity (deficit)	364	429
Total liabilities and stockholders’ equity (deficit)	1,108	1,360
Rental equipment, net
ASSETS
Property and equipment, net	9,086	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	8,383	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	703	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	609	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	107	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	64	78
Property and equipment, net | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
ASSETS
Property and equipment, net	45	50
Property and equipment, net | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
ASSETS
Property and equipment, net	$ 0	$ 0