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Acquisitions (Pro Forma Information) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Revenues $ 2,524 $ 2,057  
Pro forma revenues   2,146  
Pretax income $ 483 275  
Pro forma pretax income   271  
Impact of fair value mark-ups/useful life changes on depreciation      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pretax income   (7)  
Impact of the fair value mark-up of acquired fleet on cost of rental equipment sales      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pretax income   (4)  
Intangible asset amortization      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pretax income   (6)  
Interest expense      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pretax income   (3)  
Elimination of historic interest      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pretax income   5  
Elimination of changes in the valuation of bifurcated derivatives in convertible notes      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pretax income   (4)  
United Rentals and General Finance Corporation      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pretax income   290  
General Finance Corporation      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Revenues   89 $ 342
Pretax income   $ 15