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Nonpension Postretirement and Postemployment Benefits Change in Projected Benefit Obligations, Plan Assets, and Funded Status, Postretirement (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Amounts Recognized in Balance Sheet      
Other Assets $ 324 $ 241  
Other Liabilities (34) (33)  
Nonpension postretirement      
Defined Benefit Plan Change In Accumulated Benefit Obligation [Roll Forward]      
Actuarial (gain) loss 29    
U.S. and Canada | Nonpension postretirement      
Defined Benefit Plan Change In Accumulated Benefit Obligation [Roll Forward]      
Beginning of Year 1,116 1,069  
Service Cost 13 15 $ 18
Interest Cost 31 37 36
Actuarial (gain) loss 55 59  
Benefits paid (58) (60)  
Curtailments and special termination benefits 0 (6)  
Foreign Currency Adjustments 0 2  
End of Year 1,157 1,116 1,069
Change in plan assets      
Fair Value, Beginning of Year 1,364 1,140  
Actual Return on Plan Assets 178 282  
Employer Contributions 24 18  
Benefits Paid, Plan Assets (75) (76)  
Fair Value, End of Year 1,491 1,364 $ 1,140
Funded Status 334 248  
Amounts Recognized in Balance Sheet      
Other Assets 369 283  
Other Current Liabilities (1) (2)  
Other Liabilities (34) (33)  
Net Amount Recognized 334 248  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)      
Prior Service Cost (50) (59)  
Net Amount Recognized $ (50) $ (59)