Acquisitions (Assets Acquired and Liabilities Assumed - Ahern Rentals) (Details) - USD ($) $ in Millions	Dec. 07, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 5,940	$ 6,026	$ 5,528	$ 5,168
Ahern Rentals
Business Acquisition [Line Items]
Inventory	$ 20
Rental equipment	1,232
Property and equipment	186
Intangible assets	428
Operating lease right-of-use assets	211
Other assets	10
Total identifiable assets acquired	2,087
Accounts payable, accrued expenses and other liabilities	(24)
Operating lease liabilities	(199)
Debt (finance leases)	(38)
Total liabilities assumed	(261)
Net identifiable assets acquired	1,826
Goodwill	162
Net assets acquired	1,988
Ahern Rentals | Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 330
Life (years)	9 years
Ahern Rentals | Non-compete agreements
Business Acquisition [Line Items]
Intangible assets	$ 98
Life (years)	5 years