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Pension Benefits (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 13, 2015
Jun. 14, 2014
Jun. 13, 2015
Jun. 14, 2014
Defined Benefit Plan Disclosure [Line Items]        
Contributions to defined benefit pension plans     $ (78) $ (14)
U.S. Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Contributions to defined benefit pension plans     75  
Service cost $ 4 $ 4 8 8
Interest cost 12 13 25 25
Expected return on plan assets (14) (13) (28) (26)
Amortization of net loss 11 4 21 8
Net periodic benefit cost 13 8 26 15
Settlement $ 1 [1] $ 2 [1] $ 1 $ 5
[1] Losses are a result of settlement transactions from a non-funded plan which exceeded the sum of annual service and interest costs for that plan. These losses were recorded in G&A expenses.