CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 30, 2016	Dec. 25, 2015	Dec. 26, 2014
Income Statement [Abstract]
Revenue	$ 11,069	$ 11,811	$ 12,669
Expense
Labor and Fringe	3,159	3,290	3,377
Materials, Supplies and Other	2,069	2,336	2,484
Fuel	713	957	1,616
Depreciation	1,301	1,208	1,151
Equipment and Other Rents	438	436	428
Total Expense	7,680	8,227	9,056
Operating Income	3,389	3,584	3,613
Interest Expense	(579)	(544)	(545)
Debt Repurchase Expense	(115)	0	(16)
Other Income - Net	46	98	(8)
Earnings Before Income Taxes	2,741	3,138	3,044
Income Tax Expense (Note 11)	(1,027)	(1,170)	(1,117)
Net Earnings	$ 1,714	$ 1,968	$ 1,927
Net Earnings Per Share
Net Earnings Per Share, Basic (in dollars per share)	$ 1.81	$ 2.00	$ 1.93
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 1.81	$ 2.00	$ 1.92
Average Common Shares Outstanding
Average Common Shares Outstanding, Basic (shares)	947	983	1,001
Average Common Shares Outstanding, Assuming Dilution (shares)	948	984	1,002
Cash Dividends Paid Per Common Share (in dollars per share)	$ 0.72	$ 0.70	$ 0.63