Segment Information (Reconciliation to Consolidated Totals) (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, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	$ 1,488	$ 1,366	$ 1,150	$ 992	$ 1,161	$ 1,103	$ 875	$ 714	$ 4,996	$ 3,853	$ 3,183
Selling, general and administrative expenses									(1,400)	(1,199)	(979)
Merger related costs (1)									0	(3)	0
Restructuring charge (2)									0	(2)	(17)
Non-rental depreciation and amortization									(364)	(372)	(387)
Interest expense, net									(445)	(424)	(669)
Other income (expense), net									15	(7)	8
Income before provision for income taxes									2,802	1,846	1,139
Equipment rentals
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit									4,245	3,267	2,719
Other products and services
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit									$ 751	$ 586	$ 464