Nonpension Postretirement and Postemployment Benefits Change in Projected Benefit Obligations, Plan Assets, and Funded Status, Postretirement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Amounts Recognized in Balance Sheet
Other Assets	$ 228	$ 252
Other Liabilities	(34)	(40)
U.S. and Canada | Nonpension postretirement
Defined Benefit Plan Change In Accumulated Benefit Obligation [Roll Forward]
Beginning of Year	1,190	1,161
Service Cost	18	18	$ 21
Interest Cost	36	37	39
Actuarial (gain) loss	(105)	29
Benefits paid	(67)	(61)
Curtailments and special termination benefits	0	3
Plan Amendments	0	0
Foreign Currency Adjustments	(3)	3
End of Year	1,069	1,190	1,161
Change in plan assets
Fair Value, Beginning of Year	1,292	1,136
Actual Return on Plan Assets	(91)	217
Employer Contributions	17	13
Benefits Paid, Plan Assets	(78)	(74)
Fair Value, End of Year	1,140	1,292	$ 1,136
Funded Status	71	102
Amounts Recognized in Balance Sheet
Other Assets	107	144
Other Current Liabilities	(2)	(2)
Other Liabilities	(34)	(40)
Net Amount Recognized	71	102
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)
Prior Service Cost	(68)	(77)
Net Amount Recognized	$ (68)	$ (77)