Postretirement Benefit Plans (Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended	3 Months Ended
	Mar. 25, 2012	Mar. 27, 2011	Mar. 30, 2012 Qualified Defined Benefit Pension Plans [Member]	Mar. 25, 2012 Qualified Defined Benefit Pension Plans [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Recognition of previously deferred postretirement benefit plan amounts	$ 203,000,000	$ 165,000,000
Recognition of previously deferred postretirement benefit plan amounts, tax	111,000,000	90,000,000
Contributions to defined benefit plans			607,000,000	505,000,000
Expected contributions to defined benefit plans in the current fiscal year	1,100,000,000
Expected contributions to retiree medical and life insurance plans in the current fiscal year	$ 110,000,000