Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenues		$ 2,187	$ 2,488	$ 6,251	$ 6,895
Cost of revenues:
Cost of equipment rentals, excluding depreciation		689	813	2,083	2,324
Depreciation of rental equipment		395	417	1,216	1,211
Total cost of revenues		1,301	1,455	3,937	4,190
Gross profit		886	1,033	2,314	2,705
Selling, general and administrative expenses		232	273	721	824
Merger related costs		0	0	0	1
Restructuring charge		6	2	11	16
Non-rental depreciation and amortization		97	102	292	311
Operating income (loss)		551	656	1,290	1,553
Interest (income) expense, net		278	147	544	478
Other (income) expense, net		(2)	(1)	(6)	(6)
Income before provision for income taxes		275	510	752	1,081
Provision (benefit) for income taxes		67	119	159	245
Income before equity in net earnings (loss) of subsidiaries		208	391	593	836
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		208	391	593	836
Other comprehensive (loss) income		33	(23)	(28)	20
Comprehensive income (loss)	[1]	241	368	565	856
Eliminations
Revenues:
Revenues		0	0	0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0	0	0
Depreciation of rental equipment		0	0	0	0
Total cost of revenues		0	0	0	0
Gross profit		0	0	0	0
Selling, general and administrative expenses		2	0	(3)	0
Merger related costs					0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		0	0	0	0
Operating income (loss)		(2)	0	3	0
Interest (income) expense, net		0	0	0	0
Other (income) expense, net		(2)	0	3	0
Income before provision for income taxes		0	0	0	0
Provision (benefit) for income taxes		0	0	0	0
Income before equity in net earnings (loss) of subsidiaries		0	0	0	0
Equity in net earnings (loss) of subsidiaries		(153)	(280)	(336)	(498)
Net income		(153)	(280)	(336)	(498)
Other comprehensive (loss) income		(89)	56	86	(70)
Comprehensive income (loss)		(242)	(224)	(250)	(568)
Parent | Reportable Legal Entities
Revenues:
Revenues		0	0	0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0	0	0
Depreciation of rental equipment		0	0	0	0
Total cost of revenues		0	0	0	0
Gross profit		0	0	0	0
Selling, general and administrative expenses		(9)	(7)	(3)	14
Merger related costs					0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		9	4	20	14
Operating income (loss)		0	3	(17)	(28)
Interest (income) expense, net		(10)	(18)	(37)	(51)
Other (income) expense, net		(178)	(201)	(508)	(560)
Income before provision for income taxes		188	222	528	583
Provision (benefit) for income taxes		51	56	131	132
Income before equity in net earnings (loss) of subsidiaries		137	166	397	451
Equity in net earnings (loss) of subsidiaries		71	225	196	385
Net income		208	391	593	836
Other comprehensive (loss) income		33	(23)	(28)	20
Comprehensive income (loss)		241	368	565	856
URNA | Reportable Legal Entities
Revenues:
Revenues		1,997	2,282	5,724	6,302
Cost of revenues:
Cost of equipment rentals, excluding depreciation		641	737	1,907	2,086
Depreciation of rental equipment		363	378	1,119	1,109
Total cost of revenues		1,200	1,322	3,605	3,788
Gross profit		797	960	2,119	2,514
Selling, general and administrative expenses		205	251	620	693
Merger related costs					1
Restructuring charge		6	2	11	17
Non-rental depreciation and amortization		81	89	249	271
Operating income (loss)		505	618	1,239	1,532
Interest (income) expense, net		285	158	570	506
Other (income) expense, net		205	230	581	640
Income before provision for income taxes		15	230	88	386
Provision (benefit) for income taxes		(4)	48	(7)	90
Income before equity in net earnings (loss) of subsidiaries		19	182	95	296
Equity in net earnings (loss) of subsidiaries		52	43	101	89
Net income		71	225	196	385
Other comprehensive (loss) income		33	(23)	(28)	20
Comprehensive income (loss)		104	202	168	405
Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues		0	0	0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0	0	0
Depreciation of rental equipment		0	0	0	0
Total cost of revenues		0	0	0	0
Gross profit		0	0	0	0
Selling, general and administrative expenses		0	0	0	0
Merger related costs					0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		0	0	0	0
Operating income (loss)		0	0	0	0
Interest (income) expense, net		0	0	0	0
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		0	0	0	0
Provision (benefit) for income taxes		0	0	0	0
Income before equity in net earnings (loss) of subsidiaries		0	0	0	0
Equity in net earnings (loss) of subsidiaries		30	12	39	24
Net income		30	12	39	24
Other comprehensive (loss) income		23	(12)	(32)	30
Comprehensive income (loss)		53	0	7	54
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		190	206	526	592
Cost of revenues:
Cost of equipment rentals, excluding depreciation		48	76	175	237
Depreciation of rental equipment		32	39	97	102
Total cost of revenues		101	133	331	401
Gross profit		89	73	195	191
Selling, general and administrative expenses		23	25	73	84
Merger related costs					0
Restructuring charge		0	0	0	(1)
Non-rental depreciation and amortization		7	9	23	26
Operating income (loss)		59	39	99	82
Interest (income) expense, net		0	0	0	0
Other (income) expense, net		13	15	39	44
Income before provision for income taxes		46	24	60	38
Provision (benefit) for income taxes		13	6	16	4
Income before equity in net earnings (loss) of subsidiaries		33	18	44	34
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		33	18	44	34
Other comprehensive (loss) income		33	(21)	(26)	20
Comprehensive income (loss)		66	(3)	18	54
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		0	0	1	1
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0	1	1
Depreciation of rental equipment		0	0	0	0
Total cost of revenues		0	0	1	1
Gross profit		0	0	0	0
Selling, general and administrative expenses		11	4	34	33
Merger related costs					0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		0	0	0	0
Operating income (loss)		(11)	(4)	(34)	(33)
Interest (income) expense, net		3	7	11	23
Other (income) expense, net		(40)	(45)	(121)	(130)
Income before provision for income taxes		26	34	76	74
Provision (benefit) for income taxes		7	9	19	19
Income before equity in net earnings (loss) of subsidiaries		19	25	57	55
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		19	25	57	55
Other comprehensive (loss) income		0	0	0	0
Comprehensive income (loss)		19	25	57	55
Equipment rentals
Revenues:
Revenues		1,861	2,147	5,286	5,902
Equipment rentals | Eliminations
Revenues:
Revenues		0	0	0	0
Equipment rentals | Parent | Reportable Legal Entities
Revenues:
Revenues		0	0	0	0
Equipment rentals | URNA | Reportable Legal Entities
Revenues:
Revenues		1,705	1,971	4,856	5,407
Equipment rentals | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues		0	0	0	0
Equipment rentals | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		156	176	429	494
Equipment rentals | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		0	0	1	1
Sales of rental equipment
Revenues:
Revenue from contract with customer		199	198	583	587
Cost of revenues:
Cost of Goods and Services Sold		123	122	353	363
Sales of rental equipment | Eliminations
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Sales of rental equipment | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Sales of rental equipment | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		181	181	531	535
Cost of revenues:
Cost of Goods and Services Sold		114	113	327	334
Sales of rental equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Sales of rental equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		18	17	52	52
Cost of revenues:
Cost of Goods and Services Sold		9	9	26	29
Sales of rental equipment | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Sales of new equipment
Revenues:
Revenue from contract with customer		54	67	169	189
Cost of revenues:
Cost of Goods and Services Sold		47	58	147	163
Sales of new equipment | Eliminations
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Sales of new equipment | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Sales of new equipment | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		47	60	148	166
Cost of revenues:
Cost of Goods and Services Sold		41	52	129	143
Sales of new equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Sales of new equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		7	7	21	23
Cost of revenues:
Cost of Goods and Services Sold		6	6	18	20
Sales of new equipment | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Contractor supplies sales
Revenues:
Revenue from contract with customer		25	27	73	78
Cost of revenues:
Cost of Goods and Services Sold		18	18	52	54
Contractor supplies sales | Eliminations
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Contractor supplies sales | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Contractor supplies sales | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		22	24	64	70
Cost of revenues:
Cost of Goods and Services Sold		16	16	46	49
Contractor supplies sales | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Contractor supplies sales | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		3	3	9	8
Cost of revenues:
Cost of Goods and Services Sold		2	2	6	5
Contractor supplies sales | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Service and other revenues
Revenues:
Revenue from contract with customer		48	49	140	139
Cost of revenues:
Cost of Goods and Services Sold		29	27	86	75
Service and other revenues | Eliminations
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Service and other revenues | Parent | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Service and other revenues | URNA | Reportable Legal Entities
Revenues:
Revenue from contract with customer		42	46	125	124
Cost of revenues:
Cost of Goods and Services Sold		25	26	77	67
Service and other revenues | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		0	0	0	0
Service and other revenues | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenue from contract with customer		6	3	15	15
Cost of revenues:
Cost of Goods and Services Sold		4	1	9	8
Service and other revenues | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenue from contract with customer		0	0	0	0
Cost of revenues:
Cost of Goods and Services Sold		$ 0	$ 0	$ 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.