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Employee Benefit Plans - Components of Expense/(Income) Related to Net Benefit Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 23, 2016
Sep. 30, 2017
Sep. 23, 2016
Pension Benefits        
Components of expense/ (income) related to net benefit expense:        
Service Cost $ 8 $ 12 $ 28 $ 36
Interest Cost 23 29 69 89
Expected Return on Plan Assets (43) (39) (128) (118)
Amortization of Net Loss 10 12 31 36
Net Periodic Benefit Cost (2) 14 0 43
Special Termination Benefits - Management Workforce Reduction/Curtailment 0 0 57 0
Total Expense (2) 14 57 43
Other Post-retirement Benefits        
Components of expense/ (income) related to net benefit expense:        
Service Cost 0 0 1 1
Interest Cost 2 3 6 9
Amortization of Net Loss 0 1 0 2
Net Periodic Benefit Cost 2 4 7 12
Special Termination Benefits - Management Workforce Reduction/Curtailment 0 0 13 0
Total Expense $ 2 $ 4 $ 20 $ 12