Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) geographicDivision	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) geographicDivision	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information
Revenues	$ 3,051	$ 2,596	$ 8,346	$ 6,940
Revenue from contract with customer	578	523	1,688	1,572
Depreciation and amortization expense	560	510	1,640	1,451
Equipment rentals gross profit	1,366	1,103	3,508	2,692
Capital expenditures			2,638	2,450
Assets	21,419		21,419		$ 20,292
Equipment rentals
Segment Reporting Information
Revenues	2,732	2,277	7,369	5,895
Revenue from contract with customer	259	204	711	527
Sales of rental equipment
Segment Reporting Information
Revenues	181	183	556	644
Revenue from contract with customer	181	183	556	644
Sales of new equipment
Segment Reporting Information
Revenues	32	47	115	153
Revenue from contract with customer	32	47	115	153
Contractor supplies sales
Segment Reporting Information
Revenues	32	29	94	80
Revenue from contract with customer	32	29	94	80
Service and other revenues
Segment Reporting Information
Revenues	74	60	212	168
Revenue from contract with customer	74	60	212	168
Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 1,209	979	$ 3,046	2,307
General rentals
Segment Reporting Information
Number of geographic divisions entity operates in (locations) | geographicDivision	4		4
Revenues	$ 2,193	1,894	$ 6,102	5,254
Depreciation and amortization expense	450	412	1,300	1,184
Capital expenditures			1,995	2,116
Assets	16,953		16,953		16,087
General rentals | Equipment rentals
Segment Reporting Information
Revenues	1,942	1,636	5,322	4,375
General rentals | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	152	154	474	567
General rentals | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	12	31	58	111
General rentals | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	20	19	60	53
General rentals | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	67	54	188	148
General rentals | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	797	649	2,063	1,586
Specialty
Segment Reporting Information
Revenues	858	702	2,244	1,686
Depreciation and amortization expense	110	98	340	267
Capital expenditures			643	334
Assets	4,466		4,466		$ 4,205
Specialty | Equipment rentals
Segment Reporting Information
Revenues	790	641	2,047	1,520
Specialty | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	29	29	82	77
Specialty | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	20	16	57	42
Specialty | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	12	10	34	27
Specialty | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	7	6	24	20
Specialty | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 412	$ 330	$ 983	$ 721