Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) geographicDivision	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information
Revenues	$ 3,285	$ 2,524
Revenue from contract with customer	802	554
Depreciation and amortization expense	693	532
Equipment rentals gross profit	1,241	992
Capital expenditures	870	537
Assets	24,629		$ 24,183
Equipment rentals
Segment Reporting Information
Revenues	2,740	2,175
Revenue from contract with customer	257	205
Sales of rental equipment
Segment Reporting Information
Revenues	388	211
Revenue from contract with customer	388	211
Sales of new equipment
Segment Reporting Information
Revenues	44	45
Revenue from contract with customer	44	45
Contractor supplies sales
Segment Reporting Information
Revenues	34	29
Revenue from contract with customer	34	29
Service and other revenues
Segment Reporting Information
Revenues	79	64
Revenue from contract with customer	79	64
Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 1,003	834
General rentals
Segment Reporting Information
Number of geographic divisions entity operates in (locations) | geographicDivision	4
Revenues	$ 2,479	1,882
Depreciation and amortization expense	577	422
Capital expenditures	683	394
Assets	19,944		19,604
General rentals | Equipment rentals
Segment Reporting Information
Revenues	2,018	1,593
General rentals | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	350	184
General rentals | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	18	29
General rentals | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	21	18
General rentals | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	72	58
General rentals | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	663	575
Specialty
Segment Reporting Information
Revenues	806	642
Depreciation and amortization expense	116	110
Capital expenditures	187	143
Assets	4,685		$ 4,579
Specialty | Equipment rentals
Segment Reporting Information
Revenues	722	582
Specialty | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	38	27
Specialty | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	26	16
Specialty | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	13	11
Specialty | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	7	6
Specialty | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 340	$ 259