Preferred Stock (Schedule Of Preferred Stock) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 25, 2010		Dec. 26, 2009
Class of Stock [Line Items]
Preferred stock, shares	803,953		803,953
Balance, end of year	$ 20,899		$ 21,476		$ 17,442
Preferred Stock [Member]
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 [Member]
Class of Stock [Line Items]
Balance, beginning of year (in shares)	600,000	[1]	600,000	[1]	500,000	[1]
Balance, beginning of year	150		145		138
Redemptions (in shares)					100,000	[1]
Redemptions	7		5		7
Balance, end of year (in shares)	600,000	[1]	600,000	[1]	600,000	[1]
Balance, end of year	$ 157		$ 150		$ 145

[1] In millions.