Pension and Retiree Medical Benefits Narrative (Details) - USD ($) $ in Millions	3 Months Ended	8 Months Ended
	Sep. 08, 2018	Sep. 08, 2018	Sep. 09, 2017
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer, Discretionary		$ 1,400
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer, Discretionary	$ 37
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer, Discretionary		$ 17	$ 6