CONSOLIDATED INCOME STATEMENTS (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Income Statement
Revenue	$ 3,069	$ 3,012	$ 6,027	$ 5,978
Expense
Labor and Fringe	777	744	1,544	1,514
Materials, Supplies and Other	560	550	1,067	1,092
Fuel	397	410	841	854
Depreciation	276	263	546	520
Equipment and Other Rents	96	102	191	199
Total Expense	2,106	2,069	4,189	4,179
Operating Income	963	943	1,838	1,799
Interest Expense	(140)	(139)	(287)	(283)
Other Income - Net	9	5	6	9
Earnings Before Income Taxes	832	809	1,557	1,525
Income Tax Expense	(297)	(297)	(563)	(564)
Net Earnings	$ 535	$ 512	$ 994	$ 961
Per Common Share (Note 2)
Net Earnings Per Share, Basic (in dollars per share)	$ 0.52	$ 0.49	$ 0.97	$ 0.92
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 0.52	$ 0.49	$ 0.97	$ 0.92
Average Shares Outstanding (in shares)	1,022	1,041	1,022	1,044
Average Shares Outstanding, Assuming Dilution (in shares)	1,023	1,043	1,023	1,046
Cash Dividends Paid Per Common Share (in dollars per share)	$ 0.15	$ 0.14	$ 0.29	$ 0.26