Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenues		$ 2,117	$ 1,734
Cost of revenues:
Cost of equipment rentals, excluding depreciation		742	592
Depreciation of rental equipment		395	322
Total cost of revenues		1,356	1,088
Gross profit		761	646
Selling, general and administrative expenses		280	232
Merger related costs		1	1
Restructuring charge		8	2
Non-rental depreciation and amortization		104	71
Operating (loss) income		368	340
Interest (income) expense, net		151	109
Other (income) expense, net		(3)	(1)
Income before provision for income taxes		220	232
Provision for income taxes		45	49
Income (loss) before equity in net earnings (loss) of subsidiaries		175	183
Equity in net earnings (loss) of subsidiaries		0	0
Net income		175	183
Other comprehensive income (loss)		21	(25)
Comprehensive income (loss)	[1]	196	158
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		0	0
Merger related costs		0	0
Restructuring charge		0	0
Non-rental depreciation and amortization		0	0
Operating (loss) income		0	0
Interest (income) expense, net		0	(1)
Other (income) expense, net		0	0
Income before provision for income taxes		0	1
Provision for income taxes		0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		0	1
Equity in net earnings (loss) of subsidiaries		(84)	(122)
Net income		(84)	(121)
Other comprehensive income (loss)		(61)	73
Comprehensive income (loss)		(145)	(48)
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		53	40
Merger related costs		0	0
Restructuring charge		0	0
Non-rental depreciation and amortization		4	4
Operating (loss) income		(57)	(44)
Interest (income) expense, net		(16)	(7)
Other (income) expense, net		(172)	(141)
Income before provision for income taxes		131	104
Provision for income taxes		23	17
Income (loss) before equity in net earnings (loss) of subsidiaries		108	87
Equity in net earnings (loss) of subsidiaries		67	96
Net income		175	183
Other comprehensive income (loss)		21	(25)
Comprehensive income (loss)		196	158
URNA | Reportable Legal Entities
Revenues:
Revenues		1,925	1,593
Cost of revenues:
Cost of equipment rentals, excluding depreciation		657	535
Depreciation of rental equipment		364	297
Total cost of revenues		1,217	990
Gross profit		708	603
Selling, general and administrative expenses		183	165
Merger related costs		1	1
Restructuring charge		9	2
Non-rental depreciation and amortization		91	62
Operating (loss) income		424	373
Interest (income) expense, net		159	112
Other (income) expense, net		197	161
Income before provision for income taxes		68	100
Provision for income taxes		16	24
Income (loss) before equity in net earnings (loss) of subsidiaries		52	76
Equity in net earnings (loss) of subsidiaries		15	20
Net income		67	96
Other comprehensive income (loss)		21	(25)
Comprehensive income (loss)		88	71
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	0
Restructuring charge		0	0
Non-rental depreciation and amortization		0	0
Operating (loss) income		0	0
Interest (income) expense, net		0	1
Other (income) expense, net		0	0
Income before provision for income taxes		0	(1)
Provision for income taxes		0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		0	(1)
Equity in net earnings (loss) of subsidiaries		2	6
Net income		2	5
Other comprehensive income (loss)		21	(25)
Comprehensive income (loss)		23	(20)
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		192	141
Cost of revenues:
Cost of equipment rentals, excluding depreciation		85	57
Depreciation of rental equipment		31	25
Total cost of revenues		139	98
Gross profit		53	43
Selling, general and administrative expenses		27	19
Merger related costs		0	0
Restructuring charge		(1)	0
Non-rental depreciation and amortization		9	5
Operating (loss) income		18	19
Interest (income) expense, net		0	(1)
Other (income) expense, net		14	11
Income before provision for income taxes		4	9
Provision for income taxes		1	3
Income (loss) before equity in net earnings (loss) of subsidiaries		3	6
Equity in net earnings (loss) of subsidiaries		0	0
Net income		3	6
Other comprehensive income (loss)		19	(23)
Comprehensive income (loss)		22	(17)
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		17
Merger related costs		0
Restructuring charge		0
Non-rental depreciation and amortization		0
Operating (loss) income		(17)
Interest (income) expense, net		8
Other (income) expense, net		(42)
Income before provision for income taxes		17
Provision for income taxes		5
Income (loss) before equity in net earnings (loss) of subsidiaries		12
Equity in net earnings (loss) of subsidiaries		0
Net income		12
Other comprehensive income (loss)		0
Comprehensive income (loss)		12
Equipment rentals
Revenues:
Revenues		1,795	1,459
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		1,638	1,346
Equipment rentals | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues		0	0
Equipment rentals | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		157	113
Equipment rentals | Non Guarantor Subsidiaries- SPV | Reportable Legal Entities
Revenues:
Revenues		0	0
Sales of rental equipment
Revenues:
Revenue from contract with customer		192	181
Cost of revenues:
Cost of Goods and Services Sold		125	107
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		173	164
Cost of revenues:
Cost of Goods and Services Sold		113	98
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	17
Cost of revenues:
Cost of Goods and Services Sold		12	9
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	42
Cost of revenues:
Cost of Goods and Services Sold		54	37
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	37
Cost of revenues:
Cost of Goods and Services Sold		46	33
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	5
Cost of revenues:
Cost of Goods and Services Sold		8	4
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		24	18
Cost of revenues:
Cost of Goods and Services Sold		17	12
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	15
Cost of revenues:
Cost of Goods and Services Sold		16	10
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		2	3
Cost of revenues:
Cost of Goods and Services Sold		1	2
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		44	34
Cost of revenues:
Cost of Goods and Services Sold		23	18
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		39	31
Cost of revenues:
Cost of Goods and Services Sold		21	17
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	3
Cost of revenues:
Cost of Goods and Services Sold		2	1
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
Selling, general and administrative expenses			8
Merger related costs			0
Restructuring charge			0
Non-rental depreciation and amortization			0
Operating (loss) income			(8)
Interest (income) expense, net			5
Other (income) expense, net			(32)
Income before provision for income taxes			19
Provision for income taxes			5
Income (loss) before equity in net earnings (loss) of subsidiaries			14
Equity in net earnings (loss) of subsidiaries			0
Net income			14
Other comprehensive income (loss)			0
Comprehensive income (loss)			$ 14

[1] There were no material reclassifications from accumulated other comprehensive loss reflected in other comprehensive income (loss) during 2019 or 2018. 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 2019 or 2018.