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Acquisitions and Divestitures, Divestitures, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | Jul. 01, 2018 | Dec. 31, 2017
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Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | [1] | $ 4,564 | $ 2,441
Accumulated Amortization |  | (1,826) | (1,739)
Net Carrying Amount |  | 2,738 | 702
Contract and Program Intangible Assets |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | [1],[2] | 3,793 | 1,684
Accumulated Amortization | [2] | (1,394) | (1,320)
Net Carrying Amount | [2] | 2,399 | 364
Trade Names and Trademarks |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | [1] | 458 | 465
Accumulated Amortization |  | (166) | (160)
Net Carrying Amount |  | 292 | 305
Technology and Software |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | [1] | 158 | 137
Accumulated Amortization |  | (112) | (105)
Net Carrying Amount |  | 46 | 32
Other Intangible Assets |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | [1] | 155 | 155
Accumulated Amortization |  | (154) | (154)
Net Carrying Amount |  | $ 1 | $ 1
[1] | Change in gross carrying amounts consists primarily of adjustments for acquired intangible assets and foreign currency translation.
[2] | Consists of acquired backlog and probable follow-on work and associated customer relationships.

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