v3.25.2
Amount of Loss (Gain) from Derivative Financial Instruments Recorded in Consolidated Statements of Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Interest-Rate Contracts        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) $ 113.5 $ (40.1) $ 176.9 $ (61.8)
Interest-Rate Contracts | Financial Services | Interest and other borrowing expenses        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 113.5 (40.1) 176.9 (61.8)
Foreign-exchange contracts        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 34.4 (26.6) 36.9 (28.9)
Foreign-exchange contracts | Truck, Parts and Other        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 27.6 (26.2) 24.2 (26.1)
Foreign-exchange contracts | Truck, Parts and Other | Cost of sales and revenues | Not designated as hedging instruments        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 0.3 (0.6) (0.4) 0.2
Foreign-exchange contracts | Truck, Parts and Other | Interest and other (income) expenses, net | Not designated as hedging instruments        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 6.5 (7.6) 7.8 (7.5)
Foreign-exchange contracts | Financial Services | Interest and other borrowing expenses        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 6.8 (0.4) 12.7 (2.8)
Foreign-exchange contracts | Financial Services | Interest and other borrowing expenses | Not designated as hedging instruments        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) (0.2) 2.4 (0.1) 2.2
Cash Flow Hedging | Interest-Rate Contracts | Financial Services | Interest and other borrowing expenses        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 113.1 (42.4) 175.5 (66.9)
Cash Flow Hedging | Foreign-exchange contracts | Truck, Parts and Other | Net sales and revenues        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 6.8 0.4 4.0 9.2
Cash Flow Hedging | Foreign-exchange contracts | Truck, Parts and Other | Cost of sales and revenues        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) (1.3) (17.5) (10.8) (24.9)
Cash Flow Hedging | Foreign-exchange contracts | Truck, Parts and Other | Interest and other (income) expenses, net        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 17.8 1.2 30.2 2.5
Cash Flow Hedging | Foreign-exchange contracts | Financial Services | Interest and other borrowing expenses        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) 7.0 (2.8) 12.8 (5.0)
Net Investment Hedging | Foreign-exchange contracts | Truck, Parts and Other | Interest and other (income) expenses, net        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) (2.5) (2.1) (6.6) (5.6)
Fair Value Hedging | Interest-Rate Contracts | Financial Services | Interest and other borrowing expenses        
Derivative Instruments Gain Loss [Line Items]        
Derivatives designated as hedging instruments loss (gain) $ 0.4 $ 2.3 $ 1.4 $ 5.1