Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) numberOfDivisions	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information
Revenues	$ 2,524	$ 2,057
Revenue from contract with customer	554	539
Depreciation and amortization expense	532	466
Equipment rentals gross profit	992	714
Capital expenditures	537	314
Assets	20,169		$ 20,292
Equipment rentals
Segment Reporting Information
Revenues	2,175	1,667
Revenue from contract with customer	205	149
Sales of rental equipment
Segment Reporting Information
Revenues	211	267
Revenue from contract with customer	211	267
Sales of new equipment
Segment Reporting Information
Revenues	45	49
Revenue from contract with customer	45	49
Contractor supplies sales
Segment Reporting Information
Revenues	29	24
Revenue from contract with customer	29	24
Service and other revenues
Segment Reporting Information
Revenues	64	50
Revenue from contract with customer	64	50
Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 834	577
General rentals
Segment Reporting Information
Number of geographic divisions entity operates in (locations) | numberOfDivisions	4
Revenues	$ 1,882	1,622
Depreciation and amortization expense	422	380
Capital expenditures	394	284
Assets	15,947		16,087
General rentals | Equipment rentals
Segment Reporting Information
Revenues	1,593	1,273
General rentals | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	184	247
General rentals | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	29	42
General rentals | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	18	16
General rentals | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	58	44
General rentals | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	575	411
Specialty
Segment Reporting Information
Revenues	642	435
Depreciation and amortization expense	110	86
Capital expenditures	143	30
Assets	4,222		$ 4,205
Specialty | Equipment rentals
Segment Reporting Information
Revenues	582	394
Specialty | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	27	20
Specialty | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	16	7
Specialty | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	11	8
Specialty | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	6	6
Specialty | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 259	$ 166