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Summary of Significant Accounting Policies Update - Contracts accounted for under cumulative catch-up method (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Use of Estimates |  |  |  |
Revenue recognized from performance obligations satisfied in prior periods | $ 55 |  | $ 159 |
Cumulative catch-up method |  |  |  |
Use of Estimates |  |  |  |
Cumulative Catch-Up Adjustments | 63 | $ 5 | 167 | $ 2
Change in Accounting Estimate Financial Effect Increase In Net Income | $ 48 | $ 3 | $ 127 | $ 1
Change in Accounting Estimate Financial Effect Increase in Earnings Per Share Diluted | $ 0.19 | $ 0.01 | $ 0.49 | $ 0.00
Gross favorable adjustments | $ 79 | $ 20 | $ 205 | $ 63
Gross unfavorable adjustments | $ 16 | $ 15 | $ 38 | $ 61

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- Definition Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12A -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL108322424-203045 + Details
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