Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 18,728.5	$ 25,599.7	$ 23,495.7
Provision for losses on receivables	28.8	15.4	16.5
Investment income	35.9	82.3	60.9
Income before income taxes	1,657.9	3,099.2	2,810.2
Income taxes	359.5	711.3	615.1
Net Income	$ 1,298.4	$ 2,387.9	$ 2,195.1
Net Income Per Share
Basic	$ 3.74	$ 6.88	$ 6.25
Diluted	$ 3.74	$ 6.87	$ 6.24
Weighted Average Number of Common Shares Outstanding
Basic	346.8	346.9	351.0
Diluted	347.4	347.5	351.8
Truck, Parts and Other
Net sales and revenues	$ 17,154.3	$ 24,119.7	$ 22,138.6
Cost of sales and revenues	15,076.4	20,555.6	18,925.0
Research and development	273.9	326.6	306.1
Selling, general and administrative	459.2	561.5	524.9
Interest and other (income), net	(54.1)	(42.0)	(60.8)
Costs and Expenses, Total	15,755.4	21,401.7	19,695.2
Income before income taxes	1,398.9	2,718.0	2,443.4
Financial Services
Interest and fees	527.4	583.0	497.7
Operating lease, rental and other revenues	1,046.8	897.0	859.4
Revenues	1,574.2	1,480.0	1,357.1
Interest and other borrowing expenses	192.1	230.5	186.9
Depreciation and other expenses	1,008.0	798.2	728.0
Selling, general and administrative	122.2	137.0	119.8
Provision for losses on receivables	28.8	15.4	16.5
Costs and Expenses, Total	1,351.1	1,181.1	1,051.2
Income before income taxes	$ 223.1	$ 298.9	$ 305.9