Preferred Stock (Schedule of Preferred Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, end of year	$ 24,389		$ 22,399		$ 20,899
Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares	800,000	[1]	800,000	[1]	800,000	[1]
Preferred stock, value	41		41		41
Repurchased Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of year (in shares)	600,000	[1]	600,000	[1]	600,000	[1]
Balance, beginning of year	164		157		150
Redemptions (in shares)	0	[1]	0	[1]	0	[1]
Redemptions	7		7		7
Balance, end of year (in shares)	600,000	[1]	600,000	[1]	600,000	[1]
Balance, end of year	$ 171		$ 164		$ 157

[1] In millions.