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Restructuring, Impairment and Integration Charges (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Restructuring Cost and Reserve [Line Items]      
Total restructuring and impairment charges and other productivity initiatives $ 172 $ 320 $ 485
Restructuring, Settlement and Impairment Provisions 160 230 418
Other Productivity Initiatives 12 90 67
2014 Productivity Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring, Settlement and Impairment Provisions $ 160 $ 169 $ 357
Restructuring and impairment provisions, after-tax impact per share $ 0.09 $ 0.09 $ 0.17
2012 Productivity Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring, Settlement and Impairment Provisions $ 0 $ 61 $ 61
Restructuring and impairment provisions, after-tax impact per share   $ 0.03 $ 0.04