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Acquisitions (Assets Acquired and Liabilities Assumed - Ahern Rentals) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 07, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]          
Goodwill $ 6,026   $ 5,528 $ 5,168 $ 5,154
Ahern Rentals          
Business Acquisition [Line Items]          
Inventory   $ 44      
Rental equipment   1,352      
Property and equipment   171      
Other assets   8      
Total identifiable assets acquired   1,575      
Current liabilities   (33)      
Total liabilities assumed   (33)      
Net identifiable assets acquired   1,542      
Goodwill   470      
Net assets acquired   $ 2,012