Segment Information (Geographic Area Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 2,501	$ 2,256	$ 1,994
Revenues	$ 3,296	$ 3,051	$ 2,771	$ 2,524	$ 2,776	$ 2,596	$ 2,287	$ 2,057	11,642	9,716	8,530
Goodwill and other intangible assets, net	6,478				6,143				6,478	6,143
Property and equipment, net
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	839				612				839	612
Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	13,277				10,560				13,277	10,560
Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									10,488	8,761	7,797
Goodwill and other intangible assets, net	6,024				5,637				6,024	5,637
Domestic  | Property and equipment, net
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	789				560				789	560
Domestic  | Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	12,047				9,448				12,047	9,448
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,154	955	733
Goodwill and other intangible assets, net	454				506				454	506
Foreign | Property and equipment, net
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	50				52				50	52
Foreign | Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 1,230				$ 1,112				1,230	1,112
Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									975	747	604
Revenues									10,116	8,207	7,140
Total equipment rentals | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									9,139	7,430	6,543
Total equipment rentals | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									977	777	597
Sales of rental equipment
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									965	968	858
Revenues									965	968	858
Sales of rental equipment | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									870	873	784
Sales of rental equipment | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									95	95	74
Sales of new equipment
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									154	203	247
Revenues									154	203	247
Sales of new equipment | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									122	162	218
Sales of new equipment | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									32	41	29
Contractor supplies sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									126	109	98
Revenues									126	109	98
Contractor supplies sales | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									109	95	86
Contractor supplies sales | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									17	14	12
Service and other revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									281	229	187
Revenues									281	229	187
Service and other revenues | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									248	201	166
Service and other revenues | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 33	$ 28	$ 21