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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]          
Contract with customer, liability $ 146   $ 138    
Accounts receivable, net 2,221   $ 2,230    
Allowance for doubtful accounts 174        
Contract with customer, asset 0        
Revenue recognized 0 $ 0      
Contract with customer, performance obligation satisfied in previous period $ 0 $ 0      
Revenues | Largest customer | Customer concentration risk          
Property, Plant and Equipment [Line Items]          
Concentration risk 1.00%   1.00% 1.00% 1.00%
Accounts Receivable | Largest customer | Customer concentration risk          
Property, Plant and Equipment [Line Items]          
Concentration risk 1.00%   1.00%    
Owned equipment rentals | Revenues | Product concentration risk          
Property, Plant and Equipment [Line Items]          
Concentration risk 69.00%        
Equipment Rental | Revenues | Product concentration risk          
Property, Plant and Equipment [Line Items]          
Concentration risk 76.00%        
US | Revenues | Geographic Concentration Risk          
Property, Plant and Equipment [Line Items]          
Concentration risk 91.00%        
General rentals | Revenues | Product concentration risk          
Property, Plant and Equipment [Line Items]          
Concentration risk 73.00%