Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investment income	$ 21.8	$ 22.3	$ 28.6
Provision for losses on receivables	12.4	15.4	12.9
Income before income taxes	2,337.1	2,017.6	1,695.0
Income taxes	733.1	658.8	523.7
Net Income	$ 1,604.0	$ 1,358.8	$ 1,171.3
Net Income Per Share
Basic	$ 4.52	$ 3.83	$ 3.31
Diluted	$ 4.51	$ 3.82	$ 3.30
Weighted Average Number of Common Shares Outstanding
Basic	354.6	355.0	354.2
Diluted	355.6	356.1	355.2
Truck, Parts and Other
Net sales and revenues	$ 17,942.8	$ 17,792.8	$ 15,948.9
Cost of sales and revenues	15,292.1	15,481.6	13,900.7
Research and development	239.8	215.6	251.4
Selling, general and administrative	445.9	465.2	465.3
Interest and other expense, net	12.3	5.5	5.3
Costs and Expenses, Total	15,990.1	16,167.9	14,622.7
Income before income taxes	1,952.7	1,624.9	1,326.2
Financial Services
Interest and fees	443.8	462.6	462.8
Operating lease, rental and other revenues	728.5	741.6	712.1
Revenues	1,172.3	1,204.2	1,174.9
Interest and other borrowing expenses	118.0	133.7	155.9
Depreciation and other expenses	583.7	588.5	571.7
Selling, general and administrative	95.6	96.2	94.2
Provision for losses on receivables	12.4	15.4	12.9
Costs and Expenses, Total	809.7	833.8	834.7
Income before income taxes	$ 362.6	$ 370.4	$ 340.2