Segment Information (Financial Information by Segment) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 4,095,000,000	$ 3,992,000,000	$ 3,773,000,000	$ 3,485,000,000	$ 3,728,000,000	$ 3,765,000,000	$ 3,554,000,000	$ 3,285,000,000	$ 15,345,000,000	$ 14,332,000,000	$ 11,642,000,000
Revenues from contract with customer									3,588,000,000	3,395,000,000	2,501,000,000
Equipment rentals gross profit	1,638,000,000	$ 1,648,000,000	$ 1,518,000,000	$ 1,346,000,000	1,562,000,000	$ 1,585,000,000	$ 1,425,000,000	$ 1,241,000,000	6,150,000,000	5,813,000,000	4,996,000,000
Capital expenditures									4,130,000,000	3,864,000,000	3,690,000,000
Rental expenses									(9,195,000,000)	(8,519,000,000)	(6,646,000,000)
Total assets	28,163,000,000				25,589,000,000				28,163,000,000	25,589,000,000	24,183,000,000
Sales of rental equipment
Segment Reporting Information [Line Items]
Capital expenditures incurred but not yet paid									77,000,000	74,000,000	0
Equipment rentals
Segment Reporting Information [Line Items]
Total revenues									13,029,000,000	12,064,000,000	10,116,000,000
Revenues from contract with customer									$ 1,272,000,000	1,127,000,000	975,000,000
Equipment rentals | Revenues | Product concentration risk
Segment Reporting Information [Line Items]
Equipment rentals gross margin									77.00%
Sales of rental equipment
Segment Reporting Information [Line Items]
Total revenues									$ 1,521,000,000	1,574,000,000	965,000,000
Revenues from contract with customer									1,521,000,000	1,574,000,000	965,000,000
Sales of new equipment
Segment Reporting Information [Line Items]
Total revenues									282,000,000	218,000,000	154,000,000
Revenues from contract with customer									282,000,000	218,000,000	154,000,000
Contractor supplies sales
Segment Reporting Information [Line Items]
Total revenues									155,000,000	146,000,000	126,000,000
Revenues from contract with customer									155,000,000	146,000,000	126,000,000
Service and other revenues
Segment Reporting Information [Line Items]
Total revenues									358,000,000	330,000,000	281,000,000
Revenues from contract with customer									358,000,000	330,000,000	281,000,000
Equipment rentals
Segment Reporting Information [Line Items]
Equipment rentals gross profit									5,198,000,000	4,814,000,000	4,245,000,000
Depreciation of rental equipment									$ (2,466,000,000)	$ (2,350,000,000)	$ (1,853,000,000)
Equipment rentals | Revenues | Product concentration risk
Segment Reporting Information [Line Items]
Equipment rentals gross margin									39.90%	39.90%	42.00%
Labor and benefits
Segment Reporting Information [Line Items]
Rental expenses									$ (2,018,000,000)	$ (1,896,000,000)	$ (1,553,000,000)
Repairs and maintenance
Segment Reporting Information [Line Items]
Rental expenses									(1,041,000,000)	(1,003,000,000)	(792,000,000)
Delivery
Segment Reporting Information [Line Items]
Rental expenses									(822,000,000)	(717,000,000)	(611,000,000)
All other rental expenses
Segment Reporting Information [Line Items]
Rental expenses									(1,484,000,000)	(1,284,000,000)	(1,062,000,000)
General rentals
Segment Reporting Information [Line Items]
Total revenues									10,845,000,000	10,697,000,000	8,584,000,000
Capital expenditures									3,102,000,000	3,051,000,000	2,868,000,000
Total assets	21,044,000,000				20,411,000,000				$ 21,044,000,000	20,411,000,000	19,604,000,000
General rentals | Revenues | Product concentration risk
Segment Reporting Information [Line Items]
Equipment rentals gross margin									71.00%
General rentals | Equipment rentals
Segment Reporting Information [Line Items]
Total revenues									$ 8,945,000,000	8,803,000,000	7,345,000,000
General rentals | Sales of rental equipment
Segment Reporting Information [Line Items]
Revenues from contract with customer									1,328,000,000	1,411,000,000	835,000,000
General rentals | Sales of new equipment
Segment Reporting Information [Line Items]
Revenues from contract with customer									159,000,000	95,000,000	73,000,000
General rentals | Contractor supplies sales
Segment Reporting Information [Line Items]
Revenues from contract with customer									87,000,000	89,000,000	81,000,000
General rentals | Service and other revenues
Segment Reporting Information [Line Items]
Revenues from contract with customer									326,000,000	299,000,000	250,000,000
General rentals | Equipment rentals
Segment Reporting Information [Line Items]
Equipment rentals gross profit									3,232,000,000	3,219,000,000	2,905,000,000
Depreciation of rental equipment									$ (1,968,000,000)	$ (1,989,000,000)	$ (1,521,000,000)
General rentals | Equipment rentals | Revenues | Product concentration risk
Segment Reporting Information [Line Items]
Equipment rentals gross margin									36.10%	36.60%	39.60%
General rentals | Labor and benefits
Segment Reporting Information [Line Items]
Rental expenses									$ (1,576,000,000)	$ (1,519,000,000)	$ (1,237,000,000)
General rentals | Repairs and maintenance
Segment Reporting Information [Line Items]
Rental expenses									(830,000,000)	(827,000,000)	(645,000,000)
General rentals | Delivery
Segment Reporting Information [Line Items]
Rental expenses									(472,000,000)	(448,000,000)	(375,000,000)
General rentals | All other rental expenses
Segment Reporting Information [Line Items]
Rental expenses									(867,000,000)	(801,000,000)	(662,000,000)
Specialty
Segment Reporting Information [Line Items]
Total revenues									4,500,000,000	3,635,000,000	3,058,000,000
Capital expenditures									1,028,000,000	813,000,000	822,000,000
Total assets	$ 7,119,000,000				$ 5,178,000,000				7,119,000,000	5,178,000,000	4,579,000,000
Specialty | Equipment rentals
Segment Reporting Information [Line Items]
Total revenues									4,084,000,000	3,261,000,000	2,771,000,000
Specialty | Sales of rental equipment
Segment Reporting Information [Line Items]
Revenues from contract with customer									193,000,000	163,000,000	130,000,000
Specialty | Sales of new equipment
Segment Reporting Information [Line Items]
Revenues from contract with customer									123,000,000	123,000,000	81,000,000
Specialty | Contractor supplies sales
Segment Reporting Information [Line Items]
Revenues from contract with customer									68,000,000	57,000,000	45,000,000
Specialty | Service and other revenues
Segment Reporting Information [Line Items]
Revenues from contract with customer									32,000,000	31,000,000	31,000,000
Specialty | Equipment rentals
Segment Reporting Information [Line Items]
Equipment rentals gross profit									1,966,000,000	1,595,000,000	1,340,000,000
Depreciation of rental equipment									$ (498,000,000)	$ (361,000,000)	$ (332,000,000)
Specialty | Equipment rentals | Revenues | Product concentration risk
Segment Reporting Information [Line Items]
Equipment rentals gross margin									48.10%	48.90%	48.40%
Specialty | Labor and benefits
Segment Reporting Information [Line Items]
Rental expenses									$ (442,000,000)	$ (377,000,000)	$ (316,000,000)
Specialty | Repairs and maintenance
Segment Reporting Information [Line Items]
Rental expenses									(211,000,000)	(176,000,000)	(147,000,000)
Specialty | Delivery
Segment Reporting Information [Line Items]
Rental expenses									(350,000,000)	(269,000,000)	(236,000,000)
Specialty | All other rental expenses
Segment Reporting Information [Line Items]
Rental expenses									$ (617,000,000)	$ (483,000,000)	$ (400,000,000)