Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Re-rent revenue, Topic 842	$ 61	$ 41	$ 135	$ 105
Revenues, Topic 842	2,073	1,697	5,368	4,845
Revenues, Topic 606	523	490	1,572	1,406
Revenues, Total	2,596	2,187	6,940	6,251
Equipment rentals
Revenues:
Revenues, Topic 842	2,073	1,697	5,368	4,845
Revenues, Topic 606	204	164	527	441
Revenues, Total	2,277	1,861	5,895	5,286
Owned equipment rentals
Revenues:
Owned equipment rentals, Topic 842	1,897	1,572	4,937	4,498
Revenues, Total	1,897	1,572	4,937	4,498
Re-rent revenue
Revenues:
Re-rent revenue, Topic 842	61	41	135	104
Revenues, Total	61	41	135	104
Delivery And Pick-Up
Revenues:
Revenues, Topic 606	173	138	437	370
Revenues, Total	173	138	437	370
Other Rental Revenue
Revenues:
Other, Topic 842	115	84	296	243
Revenues, Topic 606	31	26	90	71
Revenues, Total	146	110	386	314
Ancillary and Other Rental Revenues
Revenues:
Revenues, Topic 842	115	84	296	243
Revenues, Topic 606	204	164	527	441
Revenues, Total	319	248	823	684
Sales of rental equipment
Revenues:
Revenues, Topic 606	183	199	644	583
Revenues, Total	183	199	644	583
Sales of new equipment
Revenues:
Revenues, Topic 606	47	54	153	169
Revenues, Total	47	54	153	169
Contractor supplies sales
Revenues:
Revenues, Topic 606	29	25	80	73
Revenues, Total	29	25	80	73
Service and other revenues
Revenues:
Revenues, Topic 606	60	48	168	140
Revenues, Total	$ 60	$ 48	$ 168	$ 140