Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues	$ 28,444.8	$ 33,663.8	$ 35,127.4
Cost of sales and revenues	22,736.7	26,069.6	26,894.2
Research and development	445.5	452.9	410.9
Interest and other borrowing expenses	783.0	710.8	500.6
Depreciation and other expenses	657.6	718.5	590.7
Selling, general and administrative	735.8	744.0	753.3
Provision for losses on receivables	124.5	75.6	31.3
Interest and other expenses (income), net	284.3	(113.8)	520.4
Income before income taxes	2,677.4	5,006.2	5,426.0
Investment income	346.1	394.7	292.2
Total Income Before Income Taxes	3,023.5	5,400.9	5,718.2
Income taxes	647.7	1,238.9	1,117.4
Net Income	$ 2,375.8	$ 4,162.0	$ 4,600.8
Net Income Per Share
Basic	$ 4.52	$ 7.92	$ 8.78
Diluted	$ 4.51	$ 7.9	$ 8.76
Weighted Average Number of Common Shares Outstanding
Basic	525.9	525.3	523.9
Diluted	526.8	526.6	525.0
Truck, Parts and Other
Revenues	$ 26,235.1	$ 31,564.3	$ 33,315.5
Cost of sales and revenues	22,736.7	26,069.6	26,894.2
Research and development	445.5	452.9	410.9
Selling, general and administrative	576.6	585.0	604.3
Interest and other expenses (income), net	284.3	(113.8)	520.4
Costs and Expenses, Total	24,043.1	26,993.7	28,429.8
Income before income taxes	2,192.0	4,570.6	4,885.7
Total Income Before Income Taxes	2,192.0	4,570.6	4,885.7
Financial Services
Interest and fees	1,428.7	1,295.9	1,009.3
Operating lease, rental and other revenues	781.0	803.6	802.6
Revenues	2,209.7	2,099.5	1,811.9
Interest and other borrowing expenses	783.0	710.8	500.6
Depreciation and other expenses	657.6	718.5	590.7
Selling, general and administrative	159.2	159.0	149.0
Provision for losses on receivables	124.5	75.6	31.3
Costs and Expenses, Total	1,724.3	1,663.9	1,271.6
Income before income taxes	485.4	435.6	540.3
Total Income Before Income Taxes	$ 485.4	$ 435.6	$ 540.3