Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) geographicDivision	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) geographicDivision	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information
Revenues	$ 3,765	$ 3,051	$ 10,604	$ 8,346
Revenue from contract with customer	842	578	2,496	1,688
Depreciation and amortization expense	695	560	2,084	1,640
Equipment rentals gross profit	1,585	1,366	4,251	3,508
Capital expenditures			3,345	2,638
Assets	25,832		25,832		$ 24,183
Equipment rentals
Segment Reporting Information
Revenues	3,224	2,732	8,945	7,369
Revenue from contract with customer	301	259	837	711
Sales of rental equipment
Segment Reporting Information
Revenues	366	181	1,136	556
Revenue from contract with customer	366	181	1,136	556
Sales of new equipment
Segment Reporting Information
Revenues	52	32	166	115
Revenue from contract with customer	52	32	166	115
Contractor supplies sales
Segment Reporting Information
Revenues	39	32	110	94
Revenue from contract with customer	39	32	110	94
Service and other revenues
Segment Reporting Information
Revenues	84	74	247	212
Revenue from contract with customer	84	74	247	212
Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 1,350	1,209	$ 3,526	3,046
General rentals
Segment Reporting Information
Number of geographic divisions entity operates in (locations) | geographicDivision	4		4
Revenues	$ 2,752	2,193	$ 7,884	6,102
Depreciation and amortization expense	580	450	1,737	1,300
Capital expenditures			2,663	1,995
Assets	20,780		20,780		19,604
General rentals | Equipment rentals
Segment Reporting Information
Revenues	2,307	1,942	6,514	5,322
General rentals | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	320	152	1,012	474
General rentals | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	24	12	66	58
General rentals | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	23	20	67	60
General rentals | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	78	67	225	188
General rentals | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	872	797	2,323	2,063
Specialty
Segment Reporting Information
Revenues	1,013	858	2,720	2,244
Depreciation and amortization expense	115	110	347	340
Capital expenditures			682	643
Assets	5,052		5,052		$ 4,579
Specialty | Equipment rentals
Segment Reporting Information
Revenues	917	790	2,431	2,047
Specialty | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	46	29	124	82
Specialty | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	28	20	100	57
Specialty | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	16	12	43	34
Specialty | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	6	7	22	24
Specialty | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 478	$ 412	$ 1,203	$ 983