Revenue Recognition (Changes in Accounting Principles) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues:
Revenues, Topic 842	$ 2,903	$ 2,702	$ 5,563	$ 5,185
Revenues, Topic 606	870	852	1,695	1,654
Revenues, Total	3,773	3,554	7,258	6,839
Equipment rentals
Revenues:
Revenues, Topic 842	2,903	2,702	5,563	5,185
Revenues, Topic 606	312	279	581	536
Revenues, Total	3,215	2,981	6,144	5,721
Owned equipment rentals
Revenues:
Owned equipment rentals, Topic 842	2,604	2,461	5,008	4,727
Revenues, Total	2,604	2,461	5,008	4,727
Re-rent revenue
Revenues:
Re-rent revenue, Topic 842	58	56	113	108
Revenues, Total	58	56	113	108
Delivery and pick-up
Revenues:
Revenues, Topic 606	267	238	481	441
Revenues, Total	267	238	481	441
Other
Revenues:
Other, Topic 842	241	185	442	350
Revenues, Topic 606	45	41	100	95
Revenues, Total	286	226	542	445
Total ancillary and other rental revenues
Revenues:
Revenues, Topic 842	241	185	442	350
Revenues, Topic 606	312	279	581	536
Revenues, Total	553	464	1,023	886
Sales of rental equipment
Revenues:
Revenues, Topic 606	365	382	748	770
Revenues, Total	365	382	748	770
Sales of new equipment
Revenues:
Revenues, Topic 606	61	70	109	114
Revenues, Total	61	70	109	114
Contractor supplies sales
Revenues:
Revenues, Topic 606	42	37	78	71
Revenues, Total	42	37	78	71
Service and other revenues
Revenues:
Revenues, Topic 606	90	84	179	163
Revenues, Total	$ 90	$ 84	$ 179	$ 163