Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) geographicDivision	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) geographicDivision	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information
Revenues	$ 3,554	$ 2,771	$ 6,839	$ 5,295
Revenue from contract with customer	852	556	1,654	1,110
Depreciation and amortization expense	696	548	1,389	1,080
Equipment rentals gross profit	1,425	1,150	2,666	2,142
Capital expenditures			2,227	1,477
Assets	25,506		25,506		$ 24,183
Equipment rentals
Segment Reporting Information
Revenues	2,981	2,462	5,721	4,637
Revenue from contract with customer	279	247	536	452
Sales of rental equipment
Segment Reporting Information
Revenues	382	164	770	375
Revenue from contract with customer	382	164	770	375
Sales of new equipment
Segment Reporting Information
Revenues	70	38	114	83
Revenue from contract with customer	70	38	114	83
Contractor supplies sales
Segment Reporting Information
Revenues	37	33	71	62
Revenue from contract with customer	37	33	71	62
Service and other revenues
Segment Reporting Information
Revenues	84	74	163	138
Revenue from contract with customer	84	74	163	138
Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 1,173	1,003	$ 2,176	1,837
General rentals
Segment Reporting Information
Number of geographic divisions entity operates in (locations) | geographicDivision	4		4
Revenues	$ 2,653	2,027	$ 5,132	3,909
Depreciation and amortization expense	580	428	1,157	850
Capital expenditures			1,766	1,094
Assets	20,609		20,609		19,604
General rentals | Equipment rentals
Segment Reporting Information
Revenues	2,189	1,787	4,207	3,380
General rentals | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	342	138	692	322
General rentals | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	24	17	42	46
General rentals | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	23	22	44	40
General rentals | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	75	63	147	121
General rentals | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	788	691	1,451	1,266
Specialty
Segment Reporting Information
Revenues	901	744	1,707	1,386
Depreciation and amortization expense	116	120	232	230
Capital expenditures			461	383
Assets	4,897		4,897		$ 4,579
Specialty | Equipment rentals
Segment Reporting Information
Revenues	792	675	1,514	1,257
Specialty | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	40	26	78	53
Specialty | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	46	21	72	37
Specialty | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	14	11	27	22
Specialty | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	9	11	16	17
Specialty | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 385	$ 312	$ 725	$ 571