Segment Information (Financial Information by Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 3,296	$ 3,051	$ 2,771	$ 2,524	$ 2,776	$ 2,596	$ 2,287	$ 2,057	$ 11,642	$ 9,716	$ 8,530
Revenue from contract with customer, excluding assessed tax									2,501	2,256	1,994
Depreciation and amortization									2,217	1,983	1,988
Equipment rentals gross profit	1,488	$ 1,366	$ 1,150	$ 992	1,161	$ 1,103	$ 875	$ 714	4,996	3,853	3,183
Capital expenditures									3,690	3,198	1,158
Total assets	24,183				20,292				24,183	20,292	17,868
Equipment rentals
Segment Reporting Information [Line Items]
Revenues									10,116	8,207	7,140
Revenue from contract with customer, excluding assessed tax									975	747	604
Sales of rental equipment
Segment Reporting Information [Line Items]
Revenues									965	968	858
Revenue from contract with customer, excluding assessed tax									965	968	858
Sales of new equipment
Segment Reporting Information [Line Items]
Revenues									154	203	247
Revenue from contract with customer, excluding assessed tax									154	203	247
Contractor supplies sales
Segment Reporting Information [Line Items]
Revenues									126	109	98
Revenue from contract with customer, excluding assessed tax									126	109	98
Service and other revenues
Segment Reporting Information [Line Items]
Revenues									281	229	187
Revenue from contract with customer, excluding assessed tax									281	229	187
Equipment rentals gross profit
Segment Reporting Information [Line Items]
Equipment rentals gross profit									4,245	3,267	2,719
General rentals
Segment Reporting Information [Line Items]
Revenues									8,584	7,351	6,699
Depreciation and amortization									1,765	1,611	1,633
Capital expenditures									2,868	2,719	969
Total assets	19,604				16,087				19,604	16,087	15,051
General rentals | Equipment rentals
Segment Reporting Information [Line Items]
Revenues									7,345	6,074	5,472
General rentals | Sales of rental equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									835	862	785
General rentals | Sales of new equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									73	142	214
General rentals | Contractor supplies sales
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									81	71	64
General rentals | Service and other revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									250	202	164
General rentals | Equipment rentals gross profit
Segment Reporting Information [Line Items]
Equipment rentals gross profit									2,905	2,269	1,954
Specialty
Segment Reporting Information [Line Items]
Revenues									3,058	2,365	1,831
Depreciation and amortization									452	372	355
Capital expenditures									822	479	189
Total assets	$ 4,579				$ 4,205				4,579	4,205	2,817
Specialty | Equipment rentals
Segment Reporting Information [Line Items]
Revenues									2,771	2,133	1,668
Specialty | Sales of rental equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									130	106	73
Specialty | Sales of new equipment
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									81	61	33
Specialty | Contractor supplies sales
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									45	38	34
Specialty | Service and other revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed tax									31	27	23
Specialty | Equipment rentals gross profit
Segment Reporting Information [Line Items]
Equipment rentals gross profit									$ 1,340	$ 998	$ 765