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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Revenues		$ 2,488	$ 2,116	$ 6,895	$ 5,741
Cost of revenues:
Cost of equipment rentals, excluding depreciation		813	671	2,324	1,883
Depreciation of rental equipment		417	343	1,211	988
Total cost of revenues		1,455	1,178	4,190	3,375
Gross profit		1,033	938	2,705	2,366
Selling, general and administrative expenses		273	265	824	736
Merger related costs		0	11	1	14
Restructuring charge		2	9	16	15
Non-rental depreciation and amortization		102	75	311	213
Operating income (loss)		656	578	1,553	1,388
Interest (income) expense, net		147	118	478	339
Other (income) expense, net		(1)	0	(6)	(2)
Income before provision for income taxes		510	460	1,081	1,051
Provision for income taxes		119	127	245	265
Income before equity in net earnings (loss) of subsidiaries		391	333	836	786
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		391	333	836	786
Other comprehensive income (loss)		(23)	18	20	(27)
Comprehensive income (loss)	[1]	368	351	856	759
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 for income taxes		0	0	0	0
Income before equity in net earnings (loss) of subsidiaries		0	0	0	1
Equity in net earnings (loss) of subsidiaries		(280)	(272)	(498)	(538)
Net income		(280)	(272)	(498)	(537)
Other comprehensive income (loss)		56	(54)	(70)	150
Comprehensive income (loss)		(224)	(326)	(568)	(387)
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		(7)	28	14	33
Merger related costs		0	0	0	0
Restructuring charge		0	0	0	0
Non-rental depreciation and amortization		4	3	14	11
Operating income (loss)		3	(31)	(28)	(44)
Interest (income) expense, net		(18)	(11)	(51)	(26)
Other (income) expense, net		(201)	(172)	(560)	(469)
Income before provision for income taxes		222	152	583	451
Provision for income taxes		56	45	132	105
Income before equity in net earnings (loss) of subsidiaries		166	107	451	346
Equity in net earnings (loss) of subsidiaries		225	226	385	440
Net income		391	333	836	786
Other comprehensive income (loss)		(23)	18	20	(27)
Comprehensive income (loss)		368	351	856	759
URNA | Reportable Legal Entities
Revenues:
Revenues		2,282	1,943	6,302	5,276
Cost of revenues:
Cost of equipment rentals, excluding depreciation		737	614	2,086	1,710
Depreciation of rental equipment		378	316	1,109	911
Total cost of revenues		1,322	1,076	3,788	3,074
Gross profit		960	867	2,514	2,202
Selling, general and administrative expenses		251	197	693	604
Merger related costs		0	11	1	14
Restructuring charge		2	8	17	14
Non-rental depreciation and amortization		89	65	271	185
Operating income (loss)		618	586	1,532	1,385
Interest (income) expense, net		158	122	506	349
Other (income) expense, net		230	196	640	529
Income before provision for income taxes		230	268	386	507
Provision for income taxes		48	71	90	135
Income before equity in net earnings (loss) of subsidiaries		182	197	296	372
Equity in net earnings (loss) of subsidiaries		43	29	89	68
Net income		225	226	385	440
Other comprehensive income (loss)		(23)	18	20	(27)
Comprehensive income (loss)		202	244	405	413
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	(1)	0	0
Other (income) expense, net		0	0	0	0
Income before provision for income taxes		0	1	0	0
Provision for income taxes		0	0	0	0
Income before equity in net earnings (loss) of subsidiaries		0	1	0	0
Equity in net earnings (loss) of subsidiaries		12	17	24	30
Net income		12	18	24	30
Other comprehensive income (loss)		(12)	18	30	(28)
Comprehensive income (loss)		0	36	54	2
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		206	173	592	465
Cost of revenues:
Cost of equipment rentals, excluding depreciation		76	57	237	173
Depreciation of rental equipment		39	27	102	77
Total cost of revenues		133	102	401	301
Gross profit		73	71	191	164
Selling, general and administrative expenses		25	24	84	66
Merger related costs		0	0	0	0
Restructuring charge		0	1	(1)	1
Non-rental depreciation and amortization		9	7	26	17
Operating income (loss)		39	39	82	80
Interest (income) expense, net		0	1	0	0
Other (income) expense, net		15	13	44	37
Income before provision for income taxes		24	25	38	43
Provision for income taxes		6	8	4	13
Income before equity in net earnings (loss) of subsidiaries		18	17	34	30
Equity in net earnings (loss) of subsidiaries		0	0	0	0
Net income		18	17	34	30
Other comprehensive income (loss)		(21)	18	20	(95)
Comprehensive income (loss)		(3)	35	54	(65)
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		0	0	1	0
Cost of revenues:
Cost of equipment rentals, excluding depreciation		0	0	1	0
Depreciation of rental equipment		0	0	0	0
Total cost of revenues		0	0	1	0
Gross profit		0	0	0	0
Selling, general and administrative expenses		4	16	33
Merger related costs		0	0	0
Restructuring charge		0	0	0
Non-rental depreciation and amortization		0	0	0
Operating income (loss)		(4)	(16)	(33)
Interest (income) expense, net		7	7	23
Other (income) expense, net		(45)	(37)	(130)
Income before provision for income taxes		34	14	74
Provision for income taxes		9	3	19
Income before equity in net earnings (loss) of subsidiaries		25	11	55
Equity in net earnings (loss) of subsidiaries		0	0	0
Net income		25	11	55
Other comprehensive income (loss)		0	0	0
Comprehensive income (loss)		25	11	55
Equipment rentals
Revenues:
Revenues		2,147	1,861	5,902	4,951
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		1,971	1,715	5,407	4,568
Equipment rentals | Guarantor Subsidiaries | Reportable Legal Entities
Revenues:
Revenues		0	0	0	0
Equipment rentals | Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities
Revenues:
Revenues		176	146	494	383
Equipment rentals | Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Revenues:
Revenues		0	0	1	0
Sales of rental equipment
Revenues:
Revenue from contract with customer		198	140	587	478
Cost of revenues:
Cost of Goods and Services Sold		122	83	363	282
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	128	535	435
Cost of revenues:
Cost of Goods and Services Sold		113	76	334	259
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		17	12	52	43
Cost of revenues:
Cost of Goods and Services Sold		9	7	29	23
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		67	54	189	140
Cost of revenues:
Cost of Goods and Services Sold		58	46	163	121
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		60	46	166	123
Cost of revenues:
Cost of Goods and Services Sold		52	40	143	107
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	8	23	17
Cost of revenues:
Cost of Goods and Services Sold		6	6	20	14
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	78	66
Cost of revenues:
Cost of Goods and Services Sold		18	15	54	43
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	22	70	58
Cost of revenues:
Cost of Goods and Services Sold		16	14	49	38
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	2	8	8
Cost of revenues:
Cost of Goods and Services Sold		2	1	5	5
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		49	37	139	106
Cost of revenues:
Cost of Goods and Services Sold		27	20	75	58
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		46	32	124	92
Cost of revenues:
Cost of Goods and Services Sold		26	16	67	49
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		3	5	15	14
Cost of revenues:
Cost of Goods and Services Sold		1	4	8	9
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					33
Merger related costs					0
Restructuring charge					0
Non-rental depreciation and amortization					0
Operating income (loss)					(33)
Interest (income) expense, net					17
Other (income) expense, net					(99)
Income before provision for income taxes					49
Provision for income taxes					12
Income before equity in net earnings (loss) of subsidiaries					37
Equity in net earnings (loss) of subsidiaries					0
Net income					37
Other comprehensive income (loss)					0
Comprehensive income (loss)					$ 37

[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.