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Postemployment Benefits Postretirement Benefit Plans - Amounts Recognized on Balance Sheet (Details) - Postretirement Plans - USD ($)
$ in Millions
Dec. 28, 2019
Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]    
Other current liabilities $ (15) $ (14)
Accrued postemployment costs (184) (236)
Net asset/(liability) recognized $ (199) $ (250)