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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Equipment rentals		$ 1,631	$ 1,367	$ 3,090	$ 2,533
Service and other revenues		35	29	69	56
Total revenues		1,891	1,597	3,625	2,953
Cost of revenues:
Cost of equipment rentals, excluding depreciation		620	525	1,212	999
Depreciation of rental equipment		323	266	645	514
Cost of service and other revenues		20	15	38	28
Total cost of revenues		1,109	942	2,197	1,784
Gross profit		782	655	1,428	1,169
Selling, general and administrative expenses		239	218	471	411
Merger related costs		2	14	3	16
Restructuring charge		4	19	6	19
Non-rental depreciation and amortization		67	64	138	126
Operating income (loss)		470	340	810	597
Interest (income) expense, net		112	113	221	207
Other (income) expense, net		(1)	(2)	(2)	0
Income before provision for income taxes		359	229	591	390
Provision for income taxes		89	88	138	140
Income before equity in net earnings (loss) of subsidiaries		270	141	453	250
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		270	141	453	250
Other comprehensive (loss) income		(20)	25	(45)	33
Comprehensive income (loss)	[1]	250	166	408	283
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 income (loss)		0	0	0	0
Interest (income) expense, net		0	(1)	(1)	(2)
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		0	1	1	2
Provision for income taxes		0	0	0	0
Income before equity in net earnings (loss) of subsidiaries		0	1	1	2
Equity in net earnings (loss) of subsidiaries		(144)	(89)	(266)	(135)
Net income		(144)	(88)	(265)	(133)
Other comprehensive (loss) income		131	(72)	204	(95)
Comprehensive income (loss)		(13)	(160)	(61)	(228)
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		(35)	19	5	42
Merger related costs		0	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		4	4	8	8
Operating income (loss)		31	(23)	(13)	(50)
Interest (income) expense, net		(8)	(3)	(15)	(5)
Other (income) expense, net		(156)	(131)	(297)	(243)
Income before provision for income taxes		195	111	299	198
Provision for income taxes		43	42	60	63
Income before equity in net earnings (loss) of subsidiaries		152	69	239	135
Equity in net earnings (loss) of subsidiaries		118	72	214	115
Net income		270	141	453	250
Other comprehensive (loss) income		(20)	25	(45)	33
Comprehensive income (loss)		250	166	408	283
URNA | Reportable Legal Entities
Revenues:
Equipment rentals		1,507	1,262	2,853	2,332
Service and other revenues		29	24	60	48
Total revenues		1,740	1,468	3,333	2,708
Cost of revenues:
Cost of equipment rentals, excluding depreciation		561	472	1,096	895
Depreciation of rental equipment		298	245	595	472
Cost of service and other revenues		16	14	33	25
Total cost of revenues		1,008	854	1,998	1,612
Gross profit		732	614	1,335	1,096
Selling, general and administrative expenses		242	171	407	316
Merger related costs		2	14	3	16
Restructuring charge		4	19	6	19
Non-rental depreciation and amortization		58	56	120	108
Operating income (loss)		426	354	799	637
Interest (income) expense, net		115	115	227	208
Other (income) expense, net		172	141	333	265
Income before provision for income taxes		139	98	239	164
Provision for income taxes		40	39	64	67
Income before equity in net earnings (loss) of subsidiaries		99	59	175	97
Equity in net earnings (loss) of subsidiaries		19	13	39	18
Net income		118	72	214	115
Other comprehensive (loss) income		(20)	25	(45)	33
Comprehensive income (loss)		98	97	169	148
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 income (loss)		0	0	0	0
Interest (income) expense, net		0	0	1	1
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		0	0	(1)	(1)
Provision for income taxes		0	0	0	0
Income before equity in net earnings (loss) of subsidiaries		0	0	(1)	(1)
Equity in net earnings (loss) of subsidiaries		7	4	13	2
Net income		7	4	12	1
Other comprehensive (loss) income		(21)	26	(46)	34
Comprehensive income (loss)		(14)	30	(34)	35
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Equipment rentals		124	105	237	201
Service and other revenues		6	5	9	8
Total revenues		151	129	292	245
Cost of revenues:
Cost of equipment rentals, excluding depreciation		59	53	116	104
Depreciation of rental equipment		25	21	50	42
Cost of service and other revenues		4	1	5	3
Total cost of revenues		101	88	199	172
Gross profit		50	41	93	73
Selling, general and administrative expenses		23	21	42	38
Merger related costs		0	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		5	4	10	10
Operating income (loss)		22	16	41	25
Interest (income) expense, net		0	(1)	(1)	0
Other (income) expense, net		13	11	24	23
Income before provision for income taxes		9	6	18	2
Provision for income taxes		2	2	5	0
Income before equity in net earnings (loss) of subsidiaries		7	4	13	2
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		7	4	13	2
Other comprehensive (loss) income		(90)	21	(113)	28
Comprehensive income (loss)		(83)	25	(100)	30
Non-Guarantor Subsidiaries - SPV | 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		9	7	17	15
Merger related costs		0	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		0	0	0	0
Operating income (loss)		(9)	(7)	(17)	(15)
Interest (income) expense, net		5	3	10	5
Other (income) expense, net		(30)	(23)	(62)	(45)
Income before provision for income taxes		16	13	35	25
Provision for income taxes		4	5	9	10
Income before equity in net earnings (loss) of subsidiaries		12	8	26	15
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		12	8	26	15
Other comprehensive (loss) income		0	0	0	0
Comprehensive income (loss)		12	8	26	15
Rental equipment
Revenues:
Sales revenue		157	133	338	239
Cost of revenues:
Cost of goods sold		92	81	199	141
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		143	121	307	216
Cost of revenues:
Cost of goods sold		85	75	183	129
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		14	12	31	23
Cost of revenues:
Cost of goods sold		7	6	16	12
Rental equipment | Non-Guarantor Subsidiaries - SPV | 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		44	47	86	86
Cost of revenues:
Cost of goods sold		38	40	75	74
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		40	42	77	77
Cost of revenues:
Cost of goods sold		34	35	67	66
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		4	5	9	9
Cost of revenues:
Cost of goods sold		4	5	8	8
New equipment | Non-Guarantor Subsidiaries - SPV | 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	42	39
Cost of revenues:
Cost of goods sold		16	15	28	28
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		21	19	36	35
Cost of revenues:
Cost of goods sold		14	13	24	25
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		3	2	6	4
Cost of revenues:
Cost of goods sold		2	2	4	3
Contractor supplies | Non-Guarantor Subsidiaries - SPV | 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.