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Restructuring, Impairment and Integration Charges Summary of Restructuring and Impairment Charges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 19, 2016
Mar. 21, 2015
Restructuring Cost and Reserve [Line Items]    
Restructuring, Settlement and Impairment Provisions $ 30 $ 36
Other Restructuring Costs 1 0
Total restructuring and impairment charges and other productivity initiatives 31 36
2014 Productivity Plan [Member] [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring, Settlement and Impairment Provisions 30 30
Productivity Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring, Settlement and Impairment Provisions $ 0 $ 6