Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenues	$ 1,939		$ 2,290		$ 4,064	$ 4,407
Cost of revenues:
Cost of equipment rentals, excluding depreciation	647		769		1,394	1,511
Depreciation of rental equipment	395		399		821	794
Total cost of revenues	1,238		1,379		2,636	2,735
Gross profit	701		911		1,428	1,672
Selling, general and administrative expenses	222		271		489	551
Merger related costs	0		0		0	1
Restructuring charge	3		6		5	14
Non-rental depreciation and amortization	95		105		195	209
Operating income (loss)	381		529		739	897
Interest (income) expense, net	130		180		266	331
Other (income) expense, net	0		(2)		(4)	(5)
Income before provision for income taxes	251		351		477	571
Provision (benefit) for income taxes	39		81		92	126
Income before equity in net earnings (loss) of subsidiaries	212		270		385	445
Equity in net earnings (loss) of subsidiaries	0		0		0	0
Net income	212		270		385	445
Other comprehensive (loss) income	45		22		(61)	43
Comprehensive income (loss)	257	[1]	292	[1]	324	488
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	(4)		0		(5)	0
Merger related costs						0
Restructuring charge	0		0		0	0
Non-rental depreciation and amortization	0		0		0	0
Operating income (loss)	4		0		5	0
Interest (income) expense, net	0		0		0	0
Other (income) expense, net	4		0		5	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	(84)		(134)		(183)	(218)
Net income	(84)		(134)		(183)	(218)
Other comprehensive (loss) income	(128)		(65)		175	(126)
Comprehensive income (loss)	(212)		(199)		(8)	(344)
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	(31)		(32)		6	21
Merger related costs						0
Restructuring charge	0		0		0	0
Non-rental depreciation and amortization	6		6		11	10
Operating income (loss)	25		26		(17)	(31)
Interest (income) expense, net	(10)		(17)		(27)	(33)
Other (income) expense, net	(158)		(187)		(330)	(359)
Income before provision for income taxes	193		230		340	361
Provision (benefit) for income taxes	46		53		80	76
Income before equity in net earnings (loss) of subsidiaries	147		177		260	285
Equity in net earnings (loss) of subsidiaries	65		93		125	160
Net income	212		270		385	445
Other comprehensive (loss) income	45		22		(61)	43
Comprehensive income (loss)	257		292		324	488
URNA | Reportable Legal Entities
Revenues:
Revenues	1,791		2,095		3,727	4,020
Cost of revenues:
Cost of equipment rentals, excluding depreciation	590		692		1,266	1,349
Depreciation of rental equipment	363		367		756	731
Total cost of revenues	1,133		1,249		2,405	2,466
Gross profit	658		846		1,322	1,554
Selling, general and administrative expenses	225		259		415	442
Merger related costs						1
Restructuring charge	3		6		5	15
Non-rental depreciation and amortization	81		91		168	182
Operating income (loss)	349		490		734	914
Interest (income) expense, net	137		189		285	348
Other (income) expense, net	180		213		376	410
Income before provision for income taxes	32		88		73	156
Provision (benefit) for income taxes	(12)		26		(3)	42
Income before equity in net earnings (loss) of subsidiaries	44		62		76	114
Equity in net earnings (loss) of subsidiaries	21		31		49	46
Net income	65		93		125	160
Other comprehensive (loss) income	45		22		(61)	43
Comprehensive income (loss)	110		115		64	203
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	(2)		10		9	12
Net income	(2)		10		9	12
Other comprehensive (loss) income	40		21		(55)	42
Comprehensive income (loss)	38		31		(46)	54
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues	147		194		336	386
Cost of revenues:
Cost of equipment rentals, excluding depreciation	56		76		127	161
Depreciation of rental equipment	32		32		65	63
Total cost of revenues	104		129		230	268
Gross profit	43		65		106	118
Selling, general and administrative expenses	25		32		50	59
Merger related costs						0
Restructuring charge	0		0		0	(1)
Non-rental depreciation and amortization	8		8		16	17
Operating income (loss)	10		25		40	43
Interest (income) expense, net	0		0		0	0
Other (income) expense, net	12		15		26	29
Income before provision for income taxes	(2)		10		14	14
Provision (benefit) for income taxes	(1)		(3)		3	(2)
Income before equity in net earnings (loss) of subsidiaries	(1)		13		11	16
Equity in net earnings (loss) of subsidiaries	0		0		0	0
Net income	(1)		13		11	16
Other comprehensive (loss) income	43		22		(59)	41
Comprehensive income (loss)	42		35		(48)	57
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues	1		1		1	1
Cost of revenues:
Cost of equipment rentals, excluding depreciation	1		1		1	1
Depreciation of rental equipment	0		0		0	0
Total cost of revenues	1		1		1	1
Gross profit	0		0		0	0
Selling, general and administrative expenses	7		12		23	29
Merger related costs						0
Restructuring charge	0		0		0	0
Non-rental depreciation and amortization	0		0		0	0
Operating income (loss)	(7)		(12)		(23)	(29)
Interest (income) expense, net	3		8		8	16
Other (income) expense, net	(38)		(43)		(81)	(85)
Income before provision for income taxes	28		23		50	40
Provision (benefit) for income taxes	6		5		12	10
Income before equity in net earnings (loss) of subsidiaries	22		18		38	30
Equity in net earnings (loss) of subsidiaries	0		0		0	0
Net income	22		18		38	30
Other comprehensive (loss) income	0		0		0	0
Comprehensive income (loss)	22		18		38	30
Equipment rentals
Revenues:
Revenues	1,642		1,960		3,425	3,755
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	1,521		1,798		3,151	3,436
Equipment rentals | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues	0		0		0	0
Equipment rentals | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues	120		161		273	318
Equipment rentals | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues	1		1		1	1
Sales of rental equipment
Revenues:
Revenue from contract with customer	176		197		384	389
Cost of revenues:
Cost of Goods and Services Sold	105		116		230	241
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	161		181		350	354
Cost of revenues:
Cost of Goods and Services Sold	97		108		213	221
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	15		16		34	35
Cost of revenues:
Cost of Goods and Services Sold	8		8		17	20
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	53		60		115	122
Cost of revenues:
Cost of Goods and Services Sold	46		51		100	105
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	48		53		101	106
Cost of revenues:
Cost of Goods and Services Sold	42		45		88	91
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	5		7		14	16
Cost of revenues:
Cost of Goods and Services Sold	4		6		12	14
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	23		27		48	51
Cost of revenues:
Cost of Goods and Services Sold	16		19		34	36
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	20		24		42	46
Cost of revenues:
Cost of Goods and Services Sold	14		17		30	33
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		6	5
Cost of revenues:
Cost of Goods and Services Sold	2		2		4	3
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	45		46		92	90
Cost of revenues:
Cost of Goods and Services Sold	29		25		57	48
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	41		39		83	78
Cost of revenues:
Cost of Goods and Services Sold	27		20		52	41
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	4		7		9	12
Cost of revenues:
Cost of Goods and Services Sold	2		5		5	7
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.