Segment Information (Financial Information by Segment) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) geographicDivision	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) geographicDivision	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information
Revenues	$ 2,771	$ 2,287	$ 5,295	$ 4,344
Revenue from contract with customer	556	510	1,110	1,049
Depreciation and amortization expense	548	475	1,080	941
Equipment rentals gross profit	1,150	875	2,142	1,589
Capital expenditures			1,477	1,261
Assets	20,820		20,820		$ 20,292
Equipment rentals
Segment Reporting Information
Revenues	2,462	1,951	4,637	3,618
Revenue from contract with customer	247	174	452	323
Sales of rental equipment
Segment Reporting Information
Revenues	164	194	375	461
Revenue from contract with customer	164	194	375	461
Sales of new equipment
Segment Reporting Information
Revenues	38	57	83	106
Revenue from contract with customer	38	57	83	106
Contractor supplies sales
Segment Reporting Information
Revenues	33	27	62	51
Revenue from contract with customer	33	27	62	51
Service and other revenues
Segment Reporting Information
Revenues	74	58	138	108
Revenue from contract with customer	74	58	138	108
Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 1,003	751	$ 1,837	1,328
General rentals
Segment Reporting Information
Number of geographic divisions entity operates in (locations) | geographicDivision	4		4
Revenues	$ 2,027	1,738	$ 3,909	3,360
Depreciation and amortization expense	428	392	850	772
Capital expenditures			1,094	1,116
Assets	16,513		16,513		16,087
General rentals | Equipment rentals
Segment Reporting Information
Revenues	1,787	1,466	3,380	2,739
General rentals | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	138	166	322	413
General rentals | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	17	38	46	80
General rentals | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	22	18	40	34
General rentals | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	63	50	121	94
General rentals | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	691	526	1,266	937
Specialty
Segment Reporting Information
Revenues	744	549	1,386	984
Depreciation and amortization expense	120	83	230	169
Capital expenditures			383	145
Assets	4,307		4,307		$ 4,205
Specialty | Equipment rentals
Segment Reporting Information
Revenues	675	485	1,257	879
Specialty | Sales of rental equipment
Segment Reporting Information
Revenue from contract with customer	26	28	53	48
Specialty | Sales of new equipment
Segment Reporting Information
Revenue from contract with customer	21	19	37	26
Specialty | Contractor supplies sales
Segment Reporting Information
Revenue from contract with customer	11	9	22	17
Specialty | Service and other revenues
Segment Reporting Information
Revenue from contract with customer	11	8	17	14
Specialty | Equipment rentals gross profit
Segment Reporting Information
Equipment rentals gross profit	$ 312	$ 225	$ 571	$ 391