Segment Information (Reconciliation to Income (loss) from Continuing Operations) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Equipment rentals gross profit	$ 1,150,000,000	$ 875,000,000	$ 2,142,000,000	$ 1,589,000,000
Selling, general and administrative expenses	(343,000,000)	(301,000,000)	(666,000,000)	(551,000,000)
Merger related costs	0	(3,000,000)	0	(3,000,000)
Restructuring charge	(1,000,000)	0	(1,000,000)	(1,000,000)
Non-rental depreciation and amortization	(91,000,000)	(90,000,000)	(188,000,000)	(181,000,000)
Interest expense, net	(113,000,000)	(100,000,000)	(207,000,000)	(199,000,000)
Other income (expense), net	6,000,000	(4,000,000)	11,000,000	(2,000,000)
Income before provision for income taxes	608,000,000	377,000,000	1,091,000,000	652,000,000
Annual revenue, major acquisition, minimum threshold			200,000,000
Total equipment rentals gross profit
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Equipment rentals gross profit	1,003,000,000	751,000,000	1,837,000,000	1,328,000,000
Gross profit from other lines of business
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Equipment rentals gross profit	$ 147,000,000	$ 124,000,000	$ 305,000,000	$ 261,000,000