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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)

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