Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenues:
Equipment rentals		$ 1,459	$ 1,166
Service and other revenues		34	27
Total revenues		1,734	1,356
Cost of revenues:
Cost of equipment rentals, excluding depreciation		592	474
Depreciation of rental equipment		322	248
Cost of service and other revenues		18	13
Total cost of revenues		1,088	842
Gross profit		646	514
Selling, general and administrative expenses		232	193
Merger related costs		1	2
Restructuring charge		2	0
Non-rental depreciation and amortization		71	62
Operating (loss) income		340	257
Interest (income) expense, net		109	94
Other (income) expense, net		(1)	2
Income before provision for income taxes		232	161
Provision for income taxes		49	52
Income (loss) before equity in net earnings (loss) of subsidiaries		183	109
Equity in net earnings (loss) of subsidiaries		0	0
Net income		183	109
Other comprehensive (loss) income		(25)	8
Comprehensive income (loss)	[1]	158	117
Eliminations
Revenues:
Equipment rentals		0	0
Service and other revenues		0	0
Total revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Cost of service and other revenues		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
Non-rental depreciation and amortization		0	0
Operating (loss) income		0	0
Interest (income) expense, net		(1)	(1)
Other (income) expense, net		0	0
Income before provision for income taxes		1	1
Provision for income taxes		0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		1	1
Equity in net earnings (loss) of subsidiaries		(122)	(46)
Net income		(121)	(45)
Other comprehensive (loss) income		73	(23)
Comprehensive income (loss)		(48)	(68)
Parent | Reportable Legal Entities
Revenues:
Equipment rentals		0	0
Service and other revenues		0	0
Total revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Cost of service and other revenues		0	0
Total cost of revenues		0	0
Gross profit		0	0
Selling, general and administrative expenses		40	23
Merger related costs		0	0
Restructuring charge		0
Non-rental depreciation and amortization		4	4
Operating (loss) income		(44)	(27)
Interest (income) expense, net		(7)	(2)
Other (income) expense, net		(141)	(112)
Income before provision for income taxes		104	87
Provision for income taxes		17	21
Income (loss) before equity in net earnings (loss) of subsidiaries		87	66
Equity in net earnings (loss) of subsidiaries		96	43
Net income		183	109
Other comprehensive (loss) income		(25)	8
Comprehensive income (loss)		158	117
URNA | Reportable Legal Entities
Revenues:
Equipment rentals		1,346	1,070
Service and other revenues		31	24
Total revenues		1,593	1,240
Cost of revenues:
Cost of equipment rentals, excluding depreciation		535	423
Depreciation of rental equipment		297	227
Cost of service and other revenues		17	11
Total cost of revenues		990	758
Gross profit		603	482
Selling, general and administrative expenses		165	145
Merger related costs		1	2
Restructuring charge		2
Non-rental depreciation and amortization		62	52
Operating (loss) income		373	283
Interest (income) expense, net		112	93
Other (income) expense, net		161	124
Income before provision for income taxes		100	66
Provision for income taxes		24	28
Income (loss) before equity in net earnings (loss) of subsidiaries		76	38
Equity in net earnings (loss) of subsidiaries		20	5
Net income		96	43
Other comprehensive (loss) income		(25)	8
Comprehensive income (loss)		71	51
Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Equipment rentals		0	0
Service and other revenues		0	0
Total revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Cost of service and other revenues		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
Non-rental depreciation and amortization		0	0
Operating (loss) income		0	0
Interest (income) expense, net		1	1
Other (income) expense, net		0	0
Income before provision for income taxes		(1)	(1)
Provision for income taxes		0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		(1)	(1)
Equity in net earnings (loss) of subsidiaries		6	(2)
Net income		5	(3)
Other comprehensive (loss) income		(25)	8
Comprehensive income (loss)		(20)	5
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Equipment rentals		113	96
Service and other revenues		3	3
Total revenues		141	116
Cost of revenues:
Cost of equipment rentals, excluding depreciation		57	51
Depreciation of rental equipment		25	21
Cost of service and other revenues		1	2
Total cost of revenues		98	84
Gross profit		43	32
Selling, general and administrative expenses		19	17
Merger related costs		0	0
Restructuring charge		0
Non-rental depreciation and amortization		5	6
Operating (loss) income		19	9
Interest (income) expense, net		(1)	1
Other (income) expense, net		11	12
Income before provision for income taxes		9	(4)
Provision for income taxes		3	(2)
Income (loss) before equity in net earnings (loss) of subsidiaries		6	(2)
Equity in net earnings (loss) of subsidiaries		0	0
Net income		6	(2)
Other comprehensive (loss) income		(23)	7
Comprehensive income (loss)		(17)	5
Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Equipment rentals		0	0
Service and other revenues		0	0
Total revenues		0	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0
Depreciation of rental equipment		0	0
Cost of service and other revenues		0	0
Total cost of revenues		0	0
Gross profit		0	0
Selling, general and administrative expenses		8	8
Merger related costs		0	0
Restructuring charge		0
Non-rental depreciation and amortization		0	0
Operating (loss) income		(8)	(8)
Interest (income) expense, net		5	2
Other (income) expense, net		(32)	(22)
Income before provision for income taxes		19	12
Provision for income taxes		5	5
Income (loss) before equity in net earnings (loss) of subsidiaries		14	7
Equity in net earnings (loss) of subsidiaries		0	0
Net income		14	7
Other comprehensive (loss) income		0	0
Comprehensive income (loss)		14	7
Rental equipment
Revenues:
Sales revenue		181	106
Cost of revenues:
Cost of goods sold		107	60
Rental equipment | Eliminations
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
Rental equipment | Parent | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
Rental equipment | URNA | Reportable Legal Entities
Revenues:
Sales revenue		164	95
Cost of revenues:
Cost of goods sold		98	54
Rental equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
Rental equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Sales revenue		17	11
Cost of revenues:
Cost of goods sold		9	6
Rental equipment | Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
New equipment
Revenues:
Sales revenue		42	39
Cost of revenues:
Cost of goods sold		37	34
New equipment | Eliminations
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
New equipment | Parent | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
New equipment | URNA | Reportable Legal Entities
Revenues:
Sales revenue		37	35
Cost of revenues:
Cost of goods sold		33	31
New equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
New equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Sales revenue		5	4
Cost of revenues:
Cost of goods sold		4	3
New equipment | Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
Contractor supplies
Revenues:
Sales revenue		18	18
Cost of revenues:
Cost of goods sold		12	13
Contractor supplies | Eliminations
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
Contractor supplies | Parent | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
Contractor supplies | URNA | Reportable Legal Entities
Revenues:
Sales revenue		15	16
Cost of revenues:
Cost of goods sold		10	12
Contractor supplies | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		0	0
Contractor supplies | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Sales revenue		3	2
Cost of revenues:
Cost of goods sold		2	1
Contractor supplies | Non-Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Sales revenue		0	0
Cost of revenues:
Cost of goods sold		$ 0	$ 0

[1] There were no material reclassifications from accumulated other comprehensive loss reflected in other comprehensive income (loss) during 2018 or 2017. There is no tax impact related to the foreign currency translation adjustments, as the earnings are considered permanently reinvested. There were no material taxes associated with other comprehensive income (loss) during 2018 or 2017.