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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of sales and revenues $ 5,345.4 $ 6,427.7 $ 17,231.8 $ 19,873.8
Interest and other (income) expenses, net (16.8) (24.3) 299.5 (74.9)
Interest and other borrowing expenses 201.0 188.4 591.9 520.9
Total Income Before Income Taxes 743.6 1,256.3 2,318.6 4,251.6
Investment income 90.8 108.7 258.5 290.0
Tax (benefit) expense 153.6 284.2 499.7 961.6
Net Income 590.0 972.1 1,818.9 3,290.0
Reclassified out of AOCI 3.7 38.3 169.6 (28.7)
Derivative Contracts        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassified out of AOCI 2.6 36.8 167.4 (31.7)
Derivative Contracts | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Income Before Income Taxes 2.7 50.4 213.6 (32.8)
Tax (benefit) expense (0.1) (13.6) (46.2) 1.1
Net Income 2.6 36.8 167.4 (31.7)
Marketable Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassified out of AOCI 0.4 (0.7) 0.4 (2.0)
Marketable Debt Securities | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Investment income 0.6 (0.9) 0.6 (2.6)
Tax (benefit) expense (0.2) 0.2 (0.2) 0.6
Net Income 0.4 (0.7) 0.4 (2.0)
Truck, Parts and Other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net sales and revenues (6,106.5) (7,703.8) (19,983.0) (24,201.1)
Truck, Parts and Other | Derivative Contracts | Foreign-exchange contracts | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net sales and revenues 1.1 (11.4) 5.1 (2.2)
Cost of sales and revenues (12.2) (3.9) (23.0) (28.8)
Interest and other (income) expenses, net 10.8 3.0 41.0 1.6
Truck, Parts and Other | Derivative Contracts | Commodity contracts | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of sales and revenues (0.6) 3.7 (1.4) 9.6
Truck, Parts and Other | Actuarial loss | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and other (income) expenses, net 0.6 2.5 1.4 5.3
Truck, Parts and Other | Prior Service Costs | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and other (income) expenses, net 0.3 0.3 1.0 1.0
Truck, Parts and Other | Settlement loss | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Income Before Income Taxes 0.9 2.8 2.4 6.3
Tax (benefit) expense (0.2) (0.6) (0.6) (1.3)
Net Income 0.7 2.2 1.8 5.0
Financial Services | Derivative Contracts | Foreign-exchange contracts | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and other borrowing expenses 3.1 4.6 15.9 (0.5)
Financial Services | Derivative Contracts | Interest-Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest and other borrowing expenses $ 0.5 $ 54.4 $ 176.0 $ (12.5)