Segment Information (Financial Information by Segment) (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
Segment Reporting Information [Line Items]
Revenues	$ 3,728	$ 3,765	$ 3,554	$ 3,285	$ 3,296	$ 3,051	$ 2,771	$ 2,524	$ 14,332	$ 11,642	$ 9,716
Revenue from contract with customer, excluding assessed tax									3,395	2,501	2,256
Depreciation and amortization									2,781	2,217	1,983
Equipment rentals gross profit	1,562	$ 1,585	$ 1,425	$ 1,241	1,488	$ 1,366	$ 1,150	$ 992	5,813	4,996	3,853
Capital expenditures									3,864	3,690	3,198
Total assets	25,589				24,183				25,589	24,183	20,292
Equipment rentals
Segment Reporting Information [Line Items]
Revenues									12,064	10,116	8,207
Revenue from contract with customer, excluding assessed tax									1,127	975	747
Sales of rental equipment
Segment Reporting Information [Line Items]
Revenues									1,574	965	968
Revenue from contract with customer, excluding assessed tax									1,574	965	968
Sales of new equipment
Segment Reporting Information [Line Items]
Revenues									218	154	203
Revenue from contract with customer, excluding assessed tax									218	154	203
Contractor supplies sales
Segment Reporting Information [Line Items]
Revenues									146	126	109
Revenue from contract with customer, excluding assessed tax									146	126	109
Service and other revenues
Segment Reporting Information [Line Items]
Revenues									330	281	229
Revenue from contract with customer, excluding assessed tax									330	281	229
Equipment rentals gross profit
Segment Reporting Information [Line Items]
Equipment rentals gross profit									4,814	4,245	3,267
General rentals
Segment Reporting Information [Line Items]
Revenues									10,697	8,584	7,351
Depreciation and amortization									2,316	1,765	1,611
Capital expenditures									3,051	2,868	2,719
Total assets	20,411				19,604				20,411	19,604	16,087
General rentals | Equipment rentals
Segment Reporting Information [Line Items]
Revenues									8,803	7,345	6,074
General rentals | Sales of rental equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									1,411	835	862
General rentals | Sales of new equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									95	73	142
General rentals | Contractor supplies sales
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									89	81	71
General rentals | Service and other revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									299	250	202
General rentals | Equipment rentals gross profit
Segment Reporting Information [Line Items]
Equipment rentals gross profit									3,219	2,905	2,269
Specialty
Segment Reporting Information [Line Items]
Revenues									3,635	3,058	2,365
Depreciation and amortization									465	452	372
Capital expenditures									813	822	479
Total assets	$ 5,178				$ 4,579				5,178	4,579	4,205
Specialty | Equipment rentals
Segment Reporting Information [Line Items]
Revenues									3,261	2,771	2,133
Specialty | Sales of rental equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									163	130	106
Specialty | Sales of new equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									123	81	61
Specialty | Contractor supplies sales
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									57	45	38
Specialty | Service and other revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									31	31	27
Specialty | Equipment rentals gross profit
Segment Reporting Information [Line Items]
Equipment rentals gross profit									$ 1,595	$ 1,340	$ 998