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Postemployment Benefits Postretirement Benefit Plans - Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates (Details) - Postretirement Plans
$ in Millions
12 Months Ended
Dec. 28, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Increase effect on annual service and interest cost $ 3
Decrease on annual service and interest cost (2)
Increase effect on postretirement benefit obligation 55
Decrease effect on postretirement benefit obligation $ (47)