Nonpension Postretirement and Postemployment Benefits Components of Postretirement Expense (Details) - Nonpension postretirement - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement Benefit Expense	$ (175)	$ 43	$ (123)
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year	9
U.S. and Canada defined benefit plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	15	18	18
Interest Cost	37	36	37
Expected Return on Plan Assets	(86)	(94)	(98)
Amortization of Unrecognized Prior Service Cost (Credit)	(9)	(9)	(9)
Recognized net (gain) loss	(137)	81	(90)
Net periodic benefit cost	(180)	32	(142)
Curtailment and special termination benefits	(6)	0	3
Postretirement Benefit Expense	(186)	32	(139)
U.S. and Canada defined contribution plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement Benefit Expense	$ 11	$ 11	$ 16