Nonpension Postretirement and Postemployment Benefits Change in Projected Benefit Obligations, Plan Assets, and Funded Status, Postretirement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Amounts Recognized in Balance Sheet
Other Assets	$ 241	$ 228
Other Liabilities	(33)	(34)
U.S. and Canada | Nonpension postretirement
Defined Benefit Plan Change In Accumulated Benefit Obligation [Roll Forward]
Beginning of Year	1,069	1,190
Service Cost	15	18	$ 18
Interest Cost	37	36	37
Actuarial (gain) loss	59	(105)
Benefits paid	(60)	(67)
Curtailments and special termination benefits	(6)	0
Plan Amendments	0	0
Foreign Currency Adjustments	2	(3)
End of Year	1,116	1,069	1,190
Change in plan assets
Fair Value, Beginning of Year	1,140	1,292
Actual Return on Plan Assets	282	(91)
Employer Contributions	18	17
Benefits Paid, Plan Assets	(76)	(78)
Fair Value, End of Year	1,364	1,140	$ 1,292
Funded Status	248	71
Amounts Recognized in Balance Sheet
Other Assets	283	107
Other Current Liabilities	(2)	(2)
Other Liabilities	(33)	(34)
Net Amount Recognized	248	71
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)
Prior Service Cost	(59)	(68)
Net Amount Recognized	$ (59)	$ (68)