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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Use of Estimates |  |  |  |
Change in Accounting Estimate Financial Effect Increase in Income from Continuing Operations before Income Taxes | $ 5 | $ 18 | $ 2 | $ 57
Change in Accounting Estimate Financial Effect Increase in Income from Continuing Operations after Income Taxes | $ 3 | $ 11 | $ 1 | $ 36
Change in Accounting Estimate Financial Effect Increase in Earnings Per Share Diluted | $ 0.01 | $ 0.04 | $ 0.00 | $ 0.13
Gross Favorable Program Profit Adjustments | $ 20 | $ 21 | $ 63 | $ 74
Gross Unfavorable Program Profit Adjustments | $ 15 | $ 3 | $ 61 | $ 17

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