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Pensions and Other Benefit Plans - Assumed Health Care Cost Trend Rates (Details)
Dec. 29, 2019
Dec. 30, 2018
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]    
Health care cost trend rate assumed for next year 5.87% 6.12%
Rate to which the cost trend rate is assumed to decline (ultimate trend) 4.50% 4.55%