Acquisitions (Assets Acquired and Liabilities Assumed - Ahern Rentals) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Dec. 07, 2022
Business Acquisition [Line Items]
Goodwill	$ 5,792	$ 6,026
Ahern Rentals
Business Acquisition [Line Items]
Inventory			$ 24
Rental equipment			1,244
Property and equipment			186
Intangible assets			428
Operating lease right-of-use assets			211
Other assets			10
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total			2,103
Accounts payable, accrued expenses and other liabilities			(25)
Operating lease liabilities			(199)
Debt (finance leases)			(38)
Total liabilities assumed			(262)
Net identifiable assets acquired			1,841
Goodwill			147
Net assets acquired			$ 1,988