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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Revenues		$ 2,290	$ 1,891	$ 4,407	$ 3,625
Cost of revenues:
Cost of equipment rentals, excluding depreciation		769	620	1,511	1,212
Depreciation of rental equipment		399	323	794	645
Total cost of revenues		1,379	1,109	2,735	2,197
Gross profit		911	782	1,672	1,428
Selling, general and administrative expenses		271	239	551	471
Merger related costs		0	2	1	3
Restructuring charge		6	4	14	6
Non-rental depreciation and amortization		105	67	209	138
Operating income (loss)		529	470	897	810
Interest (income) expense, net		180	112	331	221
Other (income) expense, net		(2)	(1)	(5)	(2)
Income before provision for income taxes		351	359	571	591
Provision (benefit) for income taxes		81	89	126	138
Income (loss) before equity in net earnings (loss) of subsidiaries		270	270	445	453
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		270	270	445	453
Other comprehensive income (loss)		22	(20)	43	(45)
Comprehensive income (loss)	[1]	292	250	488	408
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		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	0	(1)
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		0	0	0	1
Provision (benefit) for income taxes		0	0	0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		0	0	0	1
Equity in net earnings (loss) of subsidiaries		(134)	(144)	(218)	(266)
Net income		(134)	(144)	(218)	(265)
Other comprehensive income (loss)		(65)	131	(126)	204
Comprehensive income (loss)		(199)	(13)	(344)	(61)
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		(32)	(35)	21	5
Merger related costs		0	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		6	4	10	8
Operating income (loss)		26	31	(31)	(13)
Interest (income) expense, net		(17)	(8)	(33)	(15)
Other (income) expense, net		(187)	(156)	(359)	(297)
Income before provision for income taxes		230	195	361	299
Provision (benefit) for income taxes		53	43	76	60
Income (loss) before equity in net earnings (loss) of subsidiaries		177	152	285	239
Equity in net earnings (loss) of subsidiaries		93	118	160	214
Net income		270	270	445	453
Other comprehensive income (loss)		22	(20)	43	(45)
Comprehensive income (loss)		292	250	488	408
URNA | Reportable Legal Entities
Revenues:
Revenues		2,095	1,740	4,020	3,333
Cost of revenues:
Cost of equipment rentals, excluding depreciation		692	561	1,349	1,096
Depreciation of rental equipment		367	298	731	595
Total cost of revenues		1,249	1,008	2,466	1,998
Gross profit		846	732	1,554	1,335
Selling, general and administrative expenses		259	242	442	407
Merger related costs		0	2	1	3
Restructuring charge		6	4	15	6
Non-rental depreciation and amortization		91	58	182	120
Operating income (loss)		490	426	914	799
Interest (income) expense, net		189	115	348	227
Other (income) expense, net		213	172	410	333
Income before provision for income taxes		88	139	156	239
Provision (benefit) for income taxes		26	40	42	64
Income (loss) before equity in net earnings (loss) of subsidiaries		62	99	114	175
Equity in net earnings (loss) of subsidiaries		31	19	46	39
Net income		93	118	160	214
Other comprehensive income (loss)		22	(20)	43	(45)
Comprehensive income (loss)		115	98	203	169
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	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	0	1
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		0	0	0	(1)
Provision (benefit) for income taxes		0	0	0	0
Income (loss) before equity in net earnings (loss) of subsidiaries		0	0	0	(1)
Equity in net earnings (loss) of subsidiaries		10	7	12	13
Net income		10	7	12	12
Other comprehensive income (loss)		21	(21)	42	(46)
Comprehensive income (loss)		31	(14)	54	(34)
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		194	151	386	292
Cost of revenues:
Cost of equipment rentals, excluding depreciation		76	59	161	116
Depreciation of rental equipment		32	25	63	50
Total cost of revenues		129	101	268	199
Gross profit		65	50	118	93
Selling, general and administrative expenses		32	23	59	42
Merger related costs		0	0	0	0
Restructuring charge		0	0	(1)	0
Non-rental depreciation and amortization		8	5	17	10
Operating income (loss)		25	22	43	41
Interest (income) expense, net		0	0	0	(1)
Other (income) expense, net		15	13	29	24
Income before provision for income taxes		10	9	14	18
Provision (benefit) for income taxes		(3)	2	(2)	5
Income (loss) before equity in net earnings (loss) of subsidiaries		13	7	16	13
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		13	7	16	13
Other comprehensive income (loss)		22	(90)	41	(113)
Comprehensive income (loss)		35	(83)	57	(100)
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		1	0	1	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		1	0	1	0
Depreciation of rental equipment		0	0	0	0
Total cost of revenues		1	0	1	0
Gross profit		0	0	0	0
Selling, general and administrative expenses		12	9	29
Merger related costs		0	0	0
Restructuring charge		0	0	0
Non-rental depreciation and amortization		0	0	0
Operating income (loss)		(12)	(9)	(29)
Interest (income) expense, net		8	5	16
Other (income) expense, net		(43)	(30)	(85)
Income before provision for income taxes		23	16	40
Provision (benefit) for income taxes		5	4	10
Income (loss) before equity in net earnings (loss) of subsidiaries		18	12	30
Equity in net earnings (loss) of subsidiaries		0	0	0
Net income		18	12	30
Other comprehensive income (loss)		0	0	0
Comprehensive income (loss)		18	12	30
Equipment rentals
Revenues:
Revenues		1,960	1,631	3,755	3,090
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		1,798	1,507	3,436	2,853
Equipment rentals | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues		0	0	0	0
Equipment rentals | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		161	124	318	237
Equipment rentals | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		1	0	1	0
Sales of rental equipment
Revenues:
Revenue from contract with customer		197	157	389	338
Cost of revenues:
Cost of Goods and Services Sold		116	92	241	199
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		181	143	354	307
Cost of revenues:
Cost of Goods and Services Sold		108	85	221	183
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		16	14	35	31
Cost of revenues:
Cost of Goods and Services Sold		8	7	20	16
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		60	44	122	86
Cost of revenues:
Cost of Goods and Services Sold		51	38	105	75
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		53	40	106	77
Cost of revenues:
Cost of Goods and Services Sold		45	34	91	67
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		7	4	16	9
Cost of revenues:
Cost of Goods and Services Sold		6	4	14	8
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		27	24	51	42
Cost of revenues:
Cost of Goods and Services Sold		19	16	36	28
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		24	21	46	36
Cost of revenues:
Cost of Goods and Services Sold		17	14	33	24
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	5	6
Cost of revenues:
Cost of Goods and Services Sold		2	2	3	4
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		46	35	90	69
Cost of revenues:
Cost of Goods and Services Sold		25	20	48	38
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		39	29	78	60
Cost of revenues:
Cost of Goods and Services Sold		20	16	41	33
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		7	6	12	9
Cost of revenues:
Cost of Goods and Services Sold		5	4	7	5
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
Selling, general and administrative expenses					17
Merger related costs					0
Restructuring charge					0
Non-rental depreciation and amortization					0
Operating income (loss)					(17)
Interest (income) expense, net					10
Other (income) expense, net					(62)
Income before provision for income taxes					35
Provision (benefit) for income taxes					9
Income (loss) before equity in net earnings (loss) of subsidiaries					26
Equity in net earnings (loss) of subsidiaries					0
Net income					26
Other comprehensive income (loss)					0
Comprehensive income (loss)					$ 26

[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.