v3.25.2
Segment Reporting Information by Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Revenues $ 7,510.5 $ 8,772.1 $ 14,952.2 $ 17,516.4  
Cost of sales and revenues 5,995.4 6,772.3 11,886.4 13,446.1  
Research and development 112.9 117.1 228.3 222.6  
Selling, general and administrative 179.3 183.5 360.9 370.1  
Interest and other borrowing expenses 200.3 172.5 390.9 332.5  
Depreciation and other expenses 154.9 173.6 314.6 353.9  
Provision for losses on receivables 29.2 11.7 47.5 27.8  
Other segment expenses (income) (9.5) (23.6) 316.3 (50.6)  
Income (Loss) before investment income and income taxes 848.0 1,365.0 1,407.3 2,814.0  
Investment income 83.9 95.8 167.7 181.3  
Total Income Before Income Taxes 931.9 1,460.8 1,575.0 2,995.3  
Depreciation and amortization 207.3 231.9 412.4 466.9  
Expenditures for long-lived assets 387.9 512.2 720.5 836.9  
Assets 44,094.8   44,094.8   $ 43,418.9
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 7,626.5 8,889.4 15,252.0 17,791.0  
Intersegment          
Segment Reporting Information [Line Items]          
Revenues (116.0) (117.3) (299.8) (274.6)  
Truck, Parts and Other          
Segment Reporting Information [Line Items]          
Net sales and revenues 6,962.8 8,262.3 13,876.5 16,497.3  
Revenues 6,962.8 8,262.3 13,876.5 16,497.3  
Cost of sales and revenues 5,995.4 6,772.3 11,886.4 13,446.1  
Research and development 112.9 117.1 228.3 222.6  
Selling, general and administrative 139.2 142.7 282.5 290.3  
Other segment expenses (income) (9.5) (23.6) 316.3 (50.6)  
Income (Loss) before investment income and income taxes 724.8 1,253.8 1,163.0 2,588.9  
Total Income Before Income Taxes 724.8 1,253.8 1,163.0 2,588.9  
Depreciation and amortization 102.4 104.8 203.7 214.2  
Expenditures for long-lived assets 221.8 230.5 401.9 396.9  
Assets 20,781.9   20,781.9   21,007.4
Cash and marketable securities 8,279.7   8,279.7   9,649.9
Truck, Parts and Other | Operating Segments          
Segment Reporting Information [Line Items]          
Net sales and revenues 7,078.8 8,379.6 14,176.3 16,771.9  
Truck, Parts and Other | Intersegment          
Segment Reporting Information [Line Items]          
Net sales and revenues (116.0) (117.3) (299.8) (274.6)  
Truck, Parts and Other | Truck          
Segment Reporting Information [Line Items]          
Net sales and revenues 5,243.1 6,577.8 10,468.9 13,118.8  
Cost of sales and revenues 4,787.8 5,589.4 9,504.3 11,110.6  
Research and development 81.9 89.8 167.3 167.9  
Selling, general and administrative 54.7 59.7 112.0 121.4  
Other segment expenses (income) 9.9 1.6 11.6    
Income (Loss) before investment income and income taxes 308.8 837.3 673.7 1,718.9  
Total Income Before Income Taxes 308.8 837.3 673.7 1,718.9  
Depreciation and amortization 93.1 93.4 184.0 193.0  
Expenditures for long-lived assets 213.4 201.6 375.5 351.3  
Assets 8,413.4   8,413.4   7,563.3
Truck, Parts and Other | Truck | Operating Segments          
Segment Reporting Information [Line Items]          
Net sales and revenues 5,340.9 6,674.3 10,731.7 13,353.2  
Truck, Parts and Other | Truck | Intersegment          
Segment Reporting Information [Line Items]          
Net sales and revenues (97.8) (96.5) (262.8) (234.4)  
Truck, Parts and Other | Parts          
Segment Reporting Information [Line Items]          
Net sales and revenues 1,720.9 1,664.3 3,410.8 3,340.2  
Cost of sales and revenues 1,204.7 1,160.6 2,376.2 2,291.5  
Research and development 31.0 27.1 61.0 54.3  
Selling, general and administrative 64.6 62.6 125.5 123.9  
Other segment expenses (income) 4.1 0.2 5.1 0.9  
Income (Loss) before investment income and income taxes 416.5 413.8 843.0 869.6  
Total Income Before Income Taxes 416.5 413.8 843.0 869.6  
Depreciation and amortization 2.9 4.9 7.2 8.7  
Expenditures for long-lived assets 3.1 16.5 6.4 22.0  
Assets 2,293.5   2,293.5   2,097.0
Truck, Parts and Other | Parts | Operating Segments          
Segment Reporting Information [Line Items]          
Net sales and revenues 1,739.1 1,685.1 3,447.8 3,380.4  
Truck, Parts and Other | Parts | Intersegment          
Segment Reporting Information [Line Items]          
Net sales and revenues (18.2) (20.8) (37.0) (40.2)  
Truck, Parts and Other | Other          
Segment Reporting Information [Line Items]          
Net sales and revenues (1.2) 20.2 (3.2) 38.3  
Cost of sales and revenues 2.9 22.3 5.9 44.0  
Research and development   0.2   0.4  
Selling, general and administrative 19.9 20.4 45.0 45.0  
Other segment expenses (income) (23.5) (25.4) 299.6 (51.5)  
Income (Loss) before investment income and income taxes (0.5) 2.7 (353.7) 0.4  
Total Income Before Income Taxes (0.5) 2.7 (353.7) 0.4  
Depreciation and amortization 6.4 6.5 12.5 12.5  
Expenditures for long-lived assets 5.3 12.4 20.0 23.6  
Assets 1,795.3   1,795.3   1,697.2
Truck, Parts and Other | Other | Operating Segments          
Segment Reporting Information [Line Items]          
Net sales and revenues (1.2) 20.2 (3.2) 38.3  
Financial Services          
Segment Reporting Information [Line Items]          
Revenues 547.7 509.8 1,075.7 1,019.1  
Selling, general and administrative 40.1 40.8 78.4 79.8  
Interest and other borrowing expenses 200.3 172.5 390.9 332.5  
Depreciation and other expenses 154.9 173.6 314.6 353.9  
Provision for losses on receivables 29.2 11.7 47.5 27.8  
Income (Loss) before investment income and income taxes 123.2 111.2 244.3 225.1  
Total Income Before Income Taxes 123.2 111.2 244.3 225.1  
Depreciation and amortization 104.9 127.1 208.7 252.7  
Expenditures for long-lived assets 166.1 281.7 318.6 440.0  
Assets 23,312.9   23,312.9   $ 22,411.5
Financial Services | Operating Segments          
Segment Reporting Information [Line Items]          
Revenues $ 547.7 $ 509.8 $ 1,075.7 $ 1,019.1