Segment Information (Geographic Area Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 3,395	$ 2,501	$ 2,256
Revenues	$ 3,728	$ 3,765	$ 3,554	$ 3,285	$ 3,296	$ 3,051	$ 2,771	$ 2,524	14,332	11,642	9,716
Goodwill and other intangible assets, net	6,610				6,478				6,610	6,478
Property and equipment, net
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	903				839				903	839
Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	14,001				13,277				14,001	13,277
Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									13,063	10,488	8,761
Goodwill and other intangible assets, net	6,031				6,024				6,031	6,024
Domestic  | Property and equipment, net
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	842				789				842	789
Domestic  | Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	12,679				12,047				12,679	12,047
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,269	1,154	955
Goodwill and other intangible assets, net	579				454				579	454
Foreign | Property and equipment, net
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	61				50				61	50
Foreign | Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 1,322				$ 1,230				1,322	1,230
Total equipment rentals
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									1,127	975	747
Revenues									12,064	10,116	8,207
Total equipment rentals | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									11,045	9,139	7,430
Total equipment rentals | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,019	977	777
Sales of rental equipment
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									1,574	965	968
Revenues									1,574	965	968
Sales of rental equipment | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									1,427	870	873
Sales of rental equipment | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									147	95	95
Sales of new equipment
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									218	154	203
Revenues									218	154	203
Sales of new equipment | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									168	122	162
Sales of new equipment | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									50	32	41
Contractor supplies sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									146	126	109
Revenues									146	126	109
Contractor supplies sales | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									130	109	95
Contractor supplies sales | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									16	17	14
Service and other revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									330	281	229
Revenues									330	281	229
Service and other revenues | Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									293	248	201
Service and other revenues | Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 37	$ 33	$ 28