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Retirement Plans - Pension plans with accumulated benefit obligations exceeding the fair value of plan assets (Details) - USD ($)
$ in Millions
Dec. 29, 2018
Dec. 30, 2017
Retirement Plans    
Accumulated benefit obligation $ 7,500 $ 8,100
Portion of accumulated benefit obligation for unfunded plans 369 404
Pension plans with accumulated benefit obligations exceeding the fair value of plan assets    
Accumulated benefit obligation 7,137 670
Fair value of plan assets 6,589 237
Pension plans with projected benefit obligation exceeding the fair value of plan assets    
Projected benefit obligation 7,481 8,078
Fair value of plan assets $ 6,589 $ 7,285