Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) geographicDivision	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) geographicDivision	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information
Total revenues	$ 3,992	$ 3,765	$ 11,250	$ 10,604
Revenue from contract with customer	874	842	2,569	2,496
Depreciation and amortization expense	738	695	2,141	2,084
Equipment rentals gross profit	1,648	1,585	4,512	4,251
Capital expenditures			3,553	3,345
Assets	$ 28,412		28,412		$ 25,589
Sales of rental equipment
Segment Reporting Information
Capital expenditures incurred but not yet paid			$ 183		74
General rentals
Segment Reporting Information
Number of geographic divisions entity operates in (locations) | geographicDivision	4		4
Total revenues	$ 2,745	2,752	$ 7,944	7,884
Depreciation and amortization expense	568	580	1,683	1,737
Capital expenditures			2,738	2,663
Assets	21,176		21,176		20,411
Specialty
Segment Reporting Information
Total revenues	1,247	1,013	3,306	2,720
Depreciation and amortization expense	170	115	458	347
Capital expenditures			815	682
Assets	7,236		7,236		$ 5,178
Equipment rentals
Segment Reporting Information
Total revenues	3,463	3,224	9,607	8,945
Revenue from contract with customer	345	301	926	837
Equipment rentals | General rentals
Segment Reporting Information
Total revenues	2,327	2,307	6,606	6,514
Equipment rentals | Specialty
Segment Reporting Information
Total revenues	1,136	917	3,001	2,431
Sales of rental equipment
Segment Reporting Information
Total revenues	321	366	1,069	1,136
Revenue from contract with customer	321	366	1,069	1,136
Sales of rental equipment | General rentals
Segment Reporting Information
Revenue from contract with customer	274	320	933	1,012
Sales of rental equipment | Specialty
Segment Reporting Information
Revenue from contract with customer	47	46	136	124
Sales of new equipment
Segment Reporting Information
Total revenues	77	52	186	166
Revenue from contract with customer	77	52	186	166
Sales of new equipment | General rentals
Segment Reporting Information
Revenue from contract with customer	36	24	92	66
Sales of new equipment | Specialty
Segment Reporting Information
Revenue from contract with customer	41	28	94	100
Contractor supplies sales
Segment Reporting Information
Total revenues	38	39	116	110
Revenue from contract with customer	38	39	116	110
Contractor supplies sales | General rentals
Segment Reporting Information
Revenue from contract with customer	22	23	65	67
Contractor supplies sales | Specialty
Segment Reporting Information
Revenue from contract with customer	16	16	51	43
Service and other revenues
Segment Reporting Information
Total revenues	93	84	272	247
Revenue from contract with customer	93	84	272	247
Service and other revenues | General rentals
Segment Reporting Information
Revenue from contract with customer	86	78	248	225
Service and other revenues | Specialty
Segment Reporting Information
Revenue from contract with customer	7	6	24	22
Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	1,442	1,350	3,830	3,526
Equipment rentals gross profit | General rentals
Segment Reporting Information
Equipment rentals gross profit	874	872	2,357	2,323
Equipment rentals gross profit | Specialty
Segment Reporting Information
Equipment rentals gross profit	$ 568	$ 478	$ 1,473	$ 1,203