Revenue Recognition (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:
Re-rent revenue, Topic 842									$ 233	$ 235	$ 194
Revenues, Topic 842									10,937	9,141	7,460
Revenues, Topic 606									3,395	2,501	2,256
Revenues, Total	$ 3,728	$ 3,765	$ 3,554	$ 3,285	$ 3,296	$ 3,051	$ 2,771	$ 2,524	$ 14,332	$ 11,642	$ 9,716
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]									Revenues, Total	Revenues, Total	Revenues, Total
Total equipment rentals
Revenues:
Revenues, Topic 842									$ 10,937	$ 9,141	$ 7,460
Revenues, Topic 606									1,127	975	747
Revenues, Total									12,064	10,116	8,207
Owned equipment rentals
Revenues:
Owned equipment rentals, Topic 842									9,948	8,310	6,840
Revenues, Total									9,948	8,310	6,840
Re-rent revenue
Revenues:
Re-rent revenue, Topic 842									233	235	194
Revenues, Total									233	235	194
Delivery and pick-up
Revenues:
Revenues, Topic 606									941	799	616
Revenues, Total									941	799	616
Other
Revenues:
Other, Topic 842									756	596	426
Revenues, Topic 606									186	176	131
Revenues, Total									942	772	557
Total ancillary and other rental revenues
Revenues:
Revenues, Topic 842									756	596	426
Revenues, Topic 606									1,127	975	747
Revenues, Total									1,883	1,571	1,173
Sales of rental equipment
Revenues:
Revenues, Topic 606									1,574	965	968
Revenues, Total									1,574	965	968
Sales of new equipment
Revenues:
Revenues, Topic 606									218	154	203
Revenues, Total									218	154	203
Contractor supplies sales
Revenues:
Revenues, Topic 606									146	126	109
Revenues, Total									146	126	109
Service and other revenues
Revenues:
Revenues, Topic 606									330	281	229
Revenues, Total									$ 330	$ 281	$ 229