Pension, Retiree Medical and Savings Plans (Components of Benefit Expense) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pre-tax non-cash settlement charge				$ 242
United States Pension Plan of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pre-tax non-cash settlement charge				242
Service cost		$ 431	$ 401	393
Interest cost		482	468	484
Expected return on plan assets		(943)	(849)	(834)
Amortization of prior service cost/(credits)		3	1	(1)
Amortization of net losses/(gains)		179	123	168
Gross total		152	144	210
Settlement/curtailment losses/(gain) (a)	[1]	8	8	245
Special termination benefits		36	60	11
Total		196	212	466
International
Defined Benefit Plan Disclosure [Line Items]
Service cost		92	91	80
Interest cost		93	89	94
Expected return on plan assets		(197)	(176)	(163)
Amortization of net losses/(gains)		45	53	40
Gross total		33	57	51
Settlement/curtailment losses/(gain) (a)	[1]	6	11	9
Special termination benefits		2		1
Total		41	68	61
Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost		32	28	31
Interest cost		34	36	41
Expected return on plan assets		(19)	(22)	(24)
Amortization of prior service cost/(credits)		(20)	(25)	(38)
Amortization of net losses/(gains)		(8)	(12)	(1)
Gross total		19	5	9
Settlement/curtailment losses/(gain) (a)	[1]			(14)
Special termination benefits		1	2	1
Total		$ 20	$ 7	$ (4)

[1] U.S. includes a settlement charge of $242 million related to the group annuity contract purchase in 2016. See additional unaudited information in “Items Affecting Comparability” in Management’s Discussion and Analysis of Financial Condition and Results of Operations.