Income Taxes (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Unrecognized tax benefits, excluding accrued interest, related to unrecognized tax benefits
Balance at beginning of year	$ 290	$ 294
Additions for tax positions related to current year	15	5
Additions for tax positions of prior years	1	2
Reductions for tax positions of prior years	(17)	(3)
Reductions for expiration of statute of limitations and settlements	(5)	(8)
Balance at end of year	284	290	294
Number of months in which certain audit cycles for U.S. and foreign jurisdictions could be completed	12 months
Minimum likelihood realization to record largest amount of tax benefit for tax position upon settlement with tax (as a percent)	50.00%
Recognized net tax-related interest expense	6	9	10
Net accrued interest expense	$ 126	$ 134