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Postemployment Benefits Benefit Plans - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, net periodic benefit cost/(credit) reversal $ 42,000,000      
Defined benefit plan, amortization of prior service cost/(credit) reversal $ 28,000,000      
Defined contribution plans, cost   $ 88,000,000 $ 85,000,000 $ 78,000,000
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   4,500,000,000 4,100,000,000  
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Accumulated benefit obligation   2,100,000,000 1,700,000,000  
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Net asset/(liability) recognized   988,000,000 918,000,000  
Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Settlements   0 190,000,000  
Employer contributions   0 0  
Estimated future employer contributions in 2020   0    
Curtailments   0 0 0
Pension Plans | Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Settlements   0 1,221,000,000  
Employer contributions   19,000,000 57,000,000  
Estimated future employer contributions in 2020   19,000,000    
Curtailments   0 1,000,000 0
Pension Plans | Canadian Salaried and Hourly Plans        
Defined Benefit Plan Disclosure [Line Items]        
Settlements     162,000,000  
Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Net asset/(liability) recognized   (199,000,000) (250,000,000)  
Employer contributions   13,000,000 19,000,000 1,200,000,000
Estimated future employer contributions in 2020   15,000,000    
Future amortization of prior service credits, 2020   123,000,000    
Future amortization of prior service credits, 2021   8,000,000    
Future amortization of prior service credits, 2022   6,000,000    
Future amortization of prior service credits, 2023   6,000,000    
Future amortization of prior service credits, 2024   2,000,000    
Curtailments   5,000,000 $ 0 $ 177,000,000
Employer contributions excluding Medicare D subsidy   $ 12,000,000    
Fixed income securities | Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations   85.00%    
Fixed income securities | Pension Plans | Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations   78.00%    
Fixed income securities | Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations   70.00%    
Return seeking assets | Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations   15.00%    
Return seeking assets | Pension Plans | Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations   22.00%    
Return seeking assets | Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations   30.00%    
Minimum | Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Year that health care cost trend rate reaches the ultimate trend rate   2020    
Maximum | Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Year that health care cost trend rate reaches the ultimate trend rate   2030