v3.25.2
Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of sales and revenues $ 5,995.4 $ 6,772.3 $ 11,886.4 $ 13,446.1
Interest and other (income) expenses, net (9.5) (23.6) 316.3 (50.6)
Interest and other borrowing expenses 200.3 172.5 390.9 332.5
Total Income Before Income Taxes 931.9 1,460.8 1,575.0 2,995.3
Investment income 83.9 95.8 167.7 181.3
Tax (benefit) expense 208.1 338.2 346.1 677.4
Net Income 723.8 1,122.6 1,228.9 2,317.9
Reclassified out of AOCI 111.4 (46.8) 165.9 (67.0)
Derivative Contracts        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassified out of AOCI 111.0 (48.1) 164.8 (68.5)
Derivative Contracts | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Income Before Income Taxes 142.7 (59.0) 210.9 (83.2)
Tax (benefit) expense (31.7) 10.9 (46.1) 14.7
Net Income 111.0 (48.1) 164.8 (68.5)
Marketable Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassified out of AOCI 0.1 (0.4)   (1.3)
Marketable Debt Securities | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Investment income 0.2 (0.5)   (1.7)
Tax (benefit) expense (0.1) 0.1   0.4
Net Income 0.1 (0.4)   (1.3)
Truck, Parts and Other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net sales and revenues (6,962.8) (8,262.3) (13,876.5) (16,497.3)
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 6.8 0.4 4.0 9.2
Cost of sales and revenues (1.3) (17.5) (10.8) (24.9)
Interest and other (income) expenses, net 17.8 (0.3) 30.2 (1.4)
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 (0.7) 3.3 (0.8) 5.9
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 0.1 1.6 0.8 2.8
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 0.4 0.4 0.7 0.7
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 0.5 2.0 1.5 3.5
Tax (benefit) expense (0.2) (0.3) (0.4) (0.7)
Net Income 0.3 1.7 1.1 2.8
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 7.0 (2.5) 12.8 (5.1)
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 $ 113.1 $ (42.4) $ 175.5 $ (66.9)