Revenue Recognition (Changes in Accounting Principles) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues:
Revenues, Topic 842	$ 3,118	$ 2,923	$ 8,681	$ 8,108
Revenues, Topic 606	874	842	2,569	2,496
Total revenues	3,992	3,765	11,250	10,604
Equipment rentals
Revenues:
Revenues, Topic 842	3,118	2,923	8,681	8,108
Revenues, Topic 606	345	301	926	837
Total revenues	3,463	3,224	9,607	8,945
Owned equipment rentals
Revenues:
Owned equipment rentals, Topic 842	2,804	2,651	7,812	7,378
Total revenues	2,804	2,651	7,812	7,378
Re-rent revenue
Revenues:
Re-rent revenue, Topic 842	71	68	184	176
Total revenues	71	68	184	176
Delivery and pick-up
Revenues:
Revenues, Topic 606	297	258	778	699
Total revenues	297	258	778	699
Other
Revenues:
Other, Topic 842	243	204	685	554
Revenues, Topic 606	48	43	148	138
Total revenues	291	247	833	692
Total ancillary and other rental revenues
Revenues:
Revenues, Topic 842	243	204	685	554
Revenues, Topic 606	345	301	926	837
Total revenues	588	505	1,611	1,391
Sales of rental equipment
Revenues:
Revenues, Topic 606	321	366	1,069	1,136
Total revenues	321	366	1,069	1,136
Sales of new equipment
Revenues:
Revenues, Topic 606	77	52	186	166
Total revenues	77	52	186	166
Contractor supplies sales
Revenues:
Revenues, Topic 606	38	39	116	110
Total revenues	38	39	116	110
Service and other revenues
Revenues:
Revenues, Topic 606	93	84	272	247
Total revenues	$ 93	$ 84	$ 272	$ 247