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	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Unfunded Plan	830
Domestic Plan [Member]
Selected information for plans with accumulated benefit obligation in excess of plan assets
Liability for service to date	$ (8,040)	$ (8,355)
Fair value of plan assets	7,223	6,919
Selected information for plans with projected benefit liability in excess of plan assets
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	(8,957)	(9,400)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	7,223	6,919
Foreign Plan [Member]
Selected information for plans with accumulated benefit obligation in excess of plan assets
Liability for service to date	(155)	(161)
Fair value of plan assets	121	119
Selected information for plans with projected benefit liability in excess of plan assets
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	(514)	(1,273)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	426	1,158
Retiree Medical Plan
Selected information for plans with projected benefit liability in excess of plan assets
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	(996)	(1,187)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	$ 285	$ 321