Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenues		$ 2,125	$ 2,117
Cost of revenues:
Cost of equipment rentals, excluding depreciation		747	742
Depreciation of rental equipment		426	395
Total cost of revenues		1,398	1,356
Gross profit		727	761
Selling, general and administrative expenses		267	280
Merger related costs		0	1
Restructuring charge		2	8
Non-rental depreciation and amortization		100	104
Operating income (loss)		358	368
Interest (income) expense, net		136	151
Other (income) expense, net		(4)	(3)
Income before provision for income taxes		226	220
Provision for income taxes		53	45
Income before equity in net earnings (loss) of subsidiaries		173	175
Equity in net earnings (loss) of subsidiaries		0	0
Net income		173	175
Other comprehensive (loss) income		(106)	21
Comprehensive income (loss)	[1]	67	196
Eliminations
Revenues:
Revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Total cost of revenues		0	0
Gross profit		0	0
Selling, general and administrative expenses		(1)	0
Merger related costs			0
Restructuring charge		0	0
Non-rental depreciation and amortization		0	0
Operating income (loss)		1	0
Interest (income) expense, net		0	0
Other (income) expense, net		1	0
Income before provision for income taxes		0	0
Provision for income taxes		0	0
Income before equity in net earnings (loss) of subsidiaries		0	0
Equity in net earnings (loss) of subsidiaries		(99)	(84)
Net income		(99)	(84)
Other comprehensive (loss) income		303	(61)
Comprehensive income (loss)		204	(145)
Parent | Reportable Legal Entities
Revenues:
Revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Total cost of revenues		0	0
Gross profit		0	0
Selling, general and administrative expenses		37	53
Merger related costs			0
Restructuring charge		0	0
Non-rental depreciation and amortization		5	4
Operating income (loss)		(42)	(57)
Interest (income) expense, net		(17)	(16)
Other (income) expense, net		(172)	(172)
Income before provision for income taxes		147	131
Provision for income taxes		34	23
Income before equity in net earnings (loss) of subsidiaries		113	108
Equity in net earnings (loss) of subsidiaries		60	67
Net income		173	175
Other comprehensive (loss) income		(106)	21
Comprehensive income (loss)		67	196
URNA | Reportable Legal Entities
Revenues:
Revenues		1,936	1,925
Cost of revenues:
Cost of equipment rentals, excluding depreciation		676	657
Depreciation of rental equipment		393	364
Total cost of revenues		1,272	1,217
Gross profit		664	708
Selling, general and administrative expenses		190	183
Merger related costs			1
Restructuring charge		2	9
Non-rental depreciation and amortization		87	91
Operating income (loss)		385	424
Interest (income) expense, net		148	159
Other (income) expense, net		196	197
Income before provision for income taxes		41	68
Provision for income taxes		9	16
Income before equity in net earnings (loss) of subsidiaries		32	52
Equity in net earnings (loss) of subsidiaries		28	15
Net income		60	67
Other comprehensive (loss) income		(106)	21
Comprehensive income (loss)		(46)	88
Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Total cost of revenues		0	0
Gross profit		0	0
Selling, general and administrative expenses		0	0
Merger related costs			0
Restructuring charge		0	0
Non-rental depreciation and amortization		0	0
Operating income (loss)		0	0
Interest (income) expense, net		0	0
Other (income) expense, net		0	0
Income before provision for income taxes		0	0
Provision for income taxes		0	0
Income before equity in net earnings (loss) of subsidiaries		0	0
Equity in net earnings (loss) of subsidiaries		11	2
Net income		11	2
Other comprehensive (loss) income		(95)	21
Comprehensive income (loss)		(84)	23
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		189	192
Cost of revenues:
Cost of equipment rentals, excluding depreciation		71	85
Depreciation of rental equipment		33	31
Total cost of revenues		126	139
Gross profit		63	53
Selling, general and administrative expenses		25	27
Merger related costs			0
Restructuring charge		0	(1)
Non-rental depreciation and amortization		8	9
Operating income (loss)		30	18
Interest (income) expense, net		0	0
Other (income) expense, net		14	14
Income before provision for income taxes		16	4
Provision for income taxes		4	1
Income before equity in net earnings (loss) of subsidiaries		12	3
Equity in net earnings (loss) of subsidiaries		0	0
Net income		12	3
Other comprehensive (loss) income		(102)	19
Comprehensive income (loss)		(90)	22
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Total cost of revenues		0	0
Gross profit		0	0
Selling, general and administrative expenses		16	17
Merger related costs			0
Restructuring charge		0	0
Non-rental depreciation and amortization		0	0
Operating income (loss)		(16)	(17)
Interest (income) expense, net		5	8
Other (income) expense, net		(43)	(42)
Income before provision for income taxes		22	17
Provision for income taxes		6	5
Income before equity in net earnings (loss) of subsidiaries		16	12
Equity in net earnings (loss) of subsidiaries		0	0
Net income		16	12
Other comprehensive (loss) income		0	0
Comprehensive income (loss)		16	12
Equipment rentals
Revenues:
Revenues		1,783	1,795
Equipment rentals | Eliminations
Revenues:
Revenues		0	0
Equipment rentals | Parent | Reportable Legal Entities
Revenues:
Revenues		0	0
Equipment rentals | URNA | Reportable Legal Entities
Revenues:
Revenues		1,630	1,638
Equipment rentals | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues		0	0
Equipment rentals | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		153	157
Equipment rentals | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		0	0
Sales of rental equipment
Revenues:
Revenue from contract with customer		208	192
Cost of revenues:
Cost of Goods and Services Sold		125	125
Sales of rental equipment | Eliminations
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Sales of rental equipment | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Sales of rental equipment | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		189	173
Cost of revenues:
Cost of Goods and Services Sold		116	113
Sales of rental equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Sales of rental equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		19	19
Cost of revenues:
Cost of Goods and Services Sold		9	12
Sales of rental equipment | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Sales of new equipment
Revenues:
Revenue from contract with customer		62	62
Cost of revenues:
Cost of Goods and Services Sold		54	54
Sales of new equipment | Eliminations
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Sales of new equipment | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Sales of new equipment | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		53	53
Cost of revenues:
Cost of Goods and Services Sold		46	46
Sales of new equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Sales of new equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		9	9
Cost of revenues:
Cost of Goods and Services Sold		8	8
Sales of new equipment | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Contractor supplies sales
Revenues:
Revenue from contract with customer		25	24
Cost of revenues:
Cost of Goods and Services Sold		18	17
Contractor supplies sales | Eliminations
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Contractor supplies sales | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Contractor supplies sales | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		22	22
Cost of revenues:
Cost of Goods and Services Sold		16	16
Contractor supplies sales | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Contractor supplies sales | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		3	2
Cost of revenues:
Cost of Goods and Services Sold		2	1
Contractor supplies sales | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Service and other revenues
Revenues:
Revenue from contract with customer		47	44
Cost of revenues:
Cost of Goods and Services Sold		28	23
Service and other revenues | Eliminations
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Service and other revenues | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Service and other revenues | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		42	39
Cost of revenues:
Cost of Goods and Services Sold		25	21
Service and other revenues | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0
Service and other revenues | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		5	5
Cost of revenues:
Cost of Goods and Services Sold		3	2
Service and other revenues | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0
Cost of revenues:
Cost of Goods and Services Sold		$ 0	$ 0

[1] There were no material reclassifications from accumulated other comprehensive loss reflected in other comprehensive income (loss) during 2020 or 2019. There is no tax impact related to the foreign currency translation adjustments, as the earnings are considered permanently reinvested. We have historically considered the undistributed earnings of our foreign subsidiaries to be indefinitely reinvested. We have not repatriated funds to the U.S. to satisfy domestic liquidity needs, nor do we anticipate the need to do so. If we determine that all or a portion of our foreign earnings are no longer indefinitely reinvested, we may be subject to additional foreign withholding taxes and U.S. state income taxes. There were no material taxes associated with other comprehensive income (loss) during 2020 or 2019.