Pension, Retiree Medical and Savings Plans (Selected Information About Plans with Liability for Service to Date and Total Benefit Liability in Excess of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
United States Pension Plan of US Entity, Defined Benefit
Selected information for plans with liability for service to date in excess of plan assets
Liability for service to date	$ (577)	$ (11,643)
Fair value of plan assets	2	10,817
Selected information for plans with projected benefit liability in excess of plan assets
Benefit liability	(6,555)	(12,886)
Fair value of plan assets	5,589	10,817
International
Selected information for plans with liability for service to date in excess of plan assets
Liability for service to date	(310)	(711)
Fair value of plan assets	259	552
Selected information for plans with projected benefit liability in excess of plan assets
Benefit liability	(2,291)	(2,542)
Fair value of plan assets	2,135	2,166
Retiree Medical Plan
Selected information for plans with projected benefit liability in excess of plan assets
Benefit liability	(1,384)	(1,511)
Fair value of plan assets	$ 406	$ 365