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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Equipment rentals		$ 1,861	$ 1,536	$ 4,951	$ 4,069
Service and other revenues		37	30	106	86
Total revenues		2,116	1,766	5,741	4,719
Cost of revenues:
Cost of equipment rentals, excluding depreciation		671	557	1,883	1,556
Depreciation of rental equipment		343	290	988	804
Cost of service and other revenues		20	14	58	42
Total cost of revenues		1,178	993	3,375	2,777
Gross profit		938	773	2,366	1,942
Selling, general and administrative expenses		265	237	736	648
Merger related costs		11	16	14	32
Restructuring charge		9	9	15	28
Non-rental depreciation and amortization		75	63	213	189
Operating (loss) income		578	448	1,388	1,045
Interest (income) expense, net		118	131	339	338
Other (income) expense, net		0	(5)	(2)	(5)
Income before provision for income taxes		460	322	1,051	712
Provision for income taxes		127	123	265	263
Income (loss) before equity in net earnings (loss) of subsidiaries		333	199	786	449
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		333	199	786	449
Other comprehensive (loss) income		18	42	(27)	75
Comprehensive income (loss)	[1]	351	241	759	524
Eliminations
Revenues:
Equipment rentals		0	0	0	0
Service and other revenues		0	0	0	0
Total 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
Cost of service and other revenues		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	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		0	0	0	0
Operating (loss) income		0	0	0	0
Interest (income) expense, net		0	(2)	(1)	(4)
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		0	2	1	4
Provision for income taxes		0	0	0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		0	2	1	4
Equity in net earnings (loss) of subsidiaries		(272)	(182)	(538)	(317)
Net income		(272)	(180)	(537)	(313)
Other comprehensive (loss) income		(54)	(116)	150	(211)
Comprehensive income (loss)		(326)	(296)	(387)	(524)
Parent | Reportable Legal Entities
Revenues:
Equipment rentals		0	0	0	0
Service and other revenues		0	0	0	0
Total 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
Cost of service and other revenues		0	0	0	0
Total cost of revenues		0	0	0	0
Gross profit		0	0	0	0
Selling, general and administrative expenses		28	42	33	84
Merger related costs		0	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		3	3	11	11
Operating (loss) income		(31)	(45)	(44)	(95)
Interest (income) expense, net		(11)	(5)	(26)	(10)
Other (income) expense, net		(172)	(144)	(469)	(387)
Income before provision for income taxes		152	104	451	302
Provision for income taxes		45	39	105	102
Income (loss) before equity in net earnings (loss) of subsidiaries		107	65	346	200
Equity in net earnings (loss) of subsidiaries		226	134	440	249
Net income		333	199	786	449
Other comprehensive (loss) income		18	42	(27)	75
Comprehensive income (loss)		351	241	759	524
URNA | Reportable Legal Entities
Revenues:
Equipment rentals		1,715	1,407	4,568	3,739
Service and other revenues		32	27	92	75
Total revenues		1,943	1,606	5,276	4,314
Cost of revenues:
Cost of equipment rentals, excluding depreciation		614	502	1,710	1,397
Depreciation of rental equipment		316	266	911	738
Cost of service and other revenues		16	12	49	37
Total cost of revenues		1,076	896	3,074	2,508
Gross profit		867	710	2,202	1,806
Selling, general and administrative expenses		197	167	604	483
Merger related costs		11	16	14	32
Restructuring charge		8	8	14	27
Non-rental depreciation and amortization		65	54	185	162
Operating (loss) income		586	465	1,385	1,102
Interest (income) expense, net		122	133	349	341
Other (income) expense, net		196	154	529	419
Income before provision for income taxes		268	178	507	342
Provision for income taxes		71	73	135	140
Income (loss) before equity in net earnings (loss) of subsidiaries		197	105	372	202
Equity in net earnings (loss) of subsidiaries		29	29	68	47
Net income		226	134	440	249
Other comprehensive (loss) income		18	42	(27)	75
Comprehensive income (loss)		244	176	413	324
Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Equipment rentals		0	0	0	0
Service and other revenues		0	0	0	0
Total 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
Cost of service and other revenues		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	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		0	0	0	0
Operating (loss) income		0	0	0	0
Interest (income) expense, net		(1)	1	0	2
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		1	(1)	0	(2)
Provision for income taxes		0	0	0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		1	(1)	0	(2)
Equity in net earnings (loss) of subsidiaries		17	19	30	21
Net income		18	18	30	19
Other comprehensive (loss) income		18	41	(28)	75
Comprehensive income (loss)		36	59	2	94
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Equipment rentals		146	129	383	330
Service and other revenues		5	3	14	11
Total revenues		173	160	465	405
Cost of revenues:
Cost of equipment rentals, excluding depreciation		57	55	173	159
Depreciation of rental equipment		27	24	77	66
Cost of service and other revenues		4	2	9	5
Total cost of revenues		102	97	301	269
Gross profit		71	63	164	136
Selling, general and administrative expenses		24	19	66	57
Merger related costs		0	0	0	0
Restructuring charge		1	1	1	1
Non-rental depreciation and amortization		7	6	17	16
Operating (loss) income		39	37	80	62
Interest (income) expense, net		1	1	0	1
Other (income) expense, net		13	10	37	33
Income before provision for income taxes		25	26	43	28
Provision for income taxes		8	7	13	7
Income (loss) before equity in net earnings (loss) of subsidiaries		17	19	30	21
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		17	19	30	21
Other comprehensive (loss) income		18	33	(95)	61
Comprehensive income (loss)		35	52	(65)	82
Non-Guarantor Subsidiaries - Domestic | Reportable Legal Entities
Revenues:
Equipment rentals		0	0	0	0
Service and other revenues		0	0	0	0
Total 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
Cost of service and other revenues		0	0	0	0
Total cost of revenues		0	0	0	0
Gross profit		0	0	0	0
Selling, general and administrative expenses		16	9	33	24
Merger related costs		0	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		0	0	0	0
Operating (loss) income		(16)	(9)	(33)	(24)
Interest (income) expense, net		7	3	17	8
Other (income) expense, net		(37)	(25)	(99)	(70)
Income before provision for income taxes		14	13	49	38
Provision for income taxes		3	4	12	14
Income (loss) before equity in net earnings (loss) of subsidiaries		11	9	37	24
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		11	9	37	24
Other comprehensive (loss) income		0	0	0	0
Comprehensive income (loss)		11	9	37	24
Rental equipment
Revenues:
Sales revenue		140	139	478	378
Cost of revenues:
Cost of goods sold		83	84	282	225
Rental equipment | Eliminations
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
Rental equipment | Parent | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
Rental equipment | URNA | Reportable Legal Entities
Revenues:
Sales revenue		128	118	435	334
Cost of revenues:
Cost of goods sold		76	73	259	202
Rental equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
Rental equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Sales revenue		12	21	43	44
Cost of revenues:
Cost of goods sold		7	11	23	23
Rental equipment | Non-Guarantor Subsidiaries - Domestic | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
New equipment
Revenues:
Sales revenue		54	40	140	126
Cost of revenues:
Cost of goods sold		46	34	121	108
New equipment | Eliminations
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
New equipment | Parent | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
New equipment | URNA | Reportable Legal Entities
Revenues:
Sales revenue		46	36	123	113
Cost of revenues:
Cost of goods sold		40	31	107	97
New equipment | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
New equipment | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Sales revenue		8	4	17	13
Cost of revenues:
Cost of goods sold		6	3	14	11
New equipment | Non-Guarantor Subsidiaries - Domestic | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
Contractor supplies
Revenues:
Sales revenue		24	21	66	60
Cost of revenues:
Cost of goods sold		15	14	43	42
Contractor supplies | Eliminations
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
Contractor supplies | Parent | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
Contractor supplies | URNA | Reportable Legal Entities
Revenues:
Sales revenue		22	18	58	53
Cost of revenues:
Cost of goods sold		14	12	38	37
Contractor supplies | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		0	0	0	0
Contractor supplies | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Sales revenue		2	3	8	7
Cost of revenues:
Cost of goods sold		1	2	5	5
Contractor supplies | Non-Guarantor Subsidiaries - Domestic | Reportable Legal Entities
Revenues:
Sales revenue		0	0	0	0
Cost of revenues:
Cost of goods sold		$ 0	$ 0	$ 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.