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Basis of Presentation - Contracts accounted for under percentage of completion method (Details) - Contracts accounted for under percentage of completion method - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Use of Estimates    
Change in Accounting Estimate Financial Effect Increase in Income from Continuing Operations before Income Taxes $ 29 $ 18
Change in Accounting Estimate Financial Effect Increase in Income from Continuing Operations after taxes $ 19 $ 11
Change in Accounting Estimate Financial Effect Increase in Earnings Per Share Diluted $ 0.07 $ 0.04
Gross Favorable Program Profit Adjustments $ 34 $ 33
Gross Unfavorable Program Profit Adjustments $ 5 $ 15