Consolidated Statements of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investment income	$ 7.3	$ 7.8	$ 21.8	$ 24.9
Net sales and revenues	4,300.1	3,820.2	12,524.9	13,053.5
Income Before Income Taxes	440.0	345.4	1,210.1	1,270.7
Income taxes	130.6	111.8	373.0	412.6
Net Income	309.4	233.6	837.1	858.1
Net Income Per Share:
Basic	$ 0.87	$ 0.66	$ 2.36	$ 2.41
Diluted	$ 0.87	$ 0.66	$ 2.36	$ 2.41
Weighted Average Common Shares Outstanding:
Basic	354.4	353.7	354.1	355.5
Diluted	355.4	354.3	355.0	356.3
Dividends declared per share	$ 0.20	$ 0.20	$ 0.60	$ 0.58
Comprehensive Income	428.2	308.9	805.5	916.5
Truck, Parts and Other
Net sales and revenues	4,006.6	3,546.7	11,649.5	12,252.5
Cost of sales and revenues	3,491.1	3,108.5	10,175.0	10,660.9
Research and development	56.6	66.8	190.5	212.9
Selling, general and administrative	111.1	113.9	341.1	362.2
Interest and other expense (income), net	3.3	0.3	4.4	(0.2)
Costs and Expenses, Total	3,662.1	3,289.5	10,711.0	11,235.8
Income Before Income Taxes	344.5	257.2	938.5	1,016.7
Financial Services
Interest and fees	116.4	115.5	345.2	336.9
Operating lease, rental and other income	177.1	158.0	530.2	464.1
Revenues	293.5	273.5	875.4	801.0
Interest and other borrowing expenses	37.9	40.6	116.2	118.4
Depreciation and other expense	140.2	127.2	423.2	367.5
Selling, general and administrative	23.6	22.6	70.8	70.8
Provision for losses on receivables	3.6	2.7	15.4	15.2
Costs and Expenses, Total	205.3	193.1	625.6	571.9
Income Before Income Taxes	$ 88.2	$ 80.4	$ 249.8	$ 229.1