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General (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 03, 2015
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Length of fiscal period   91 days 91 days 273 days 273 days
Accounting Changes and Error Corrections          
Additions to Long-term retirement benefits and other liabilities $ 24