Income Taxes (Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2011		Dec. 31, 2010		Dec. 25, 2009
Earnings From Continuing Operations [Abstract]
Earnings from continuing operations before income taxes	$ 2,888		$ 2,546		$ 1,746
Current [Abstract]
Federal	353		451		151
State	104		58		37
Total Current	457		509		188
Deferred [Abstract]
Federal	614		372		407
State	(5)	[1]	102	[1]	23	[1]
Total Deferred	609		474		430
Income Tax Expense (Benefit)	$ 1,066		$ 983		$ 618

[1] The decrease in 2011 deferred state income tax expense is a result of several state legislative changes and the favorable impact of changes in state apportionment factors. The increase in 2010 deferred state income tax expenses is attributable to the unfavorable impact of changes in state apportionment factors and the unfavorable impact of the reorganization of intermodal operations.