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Acquisitions and Divestitures, Divestitures, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Jul. 01, 2018
Dec. 31, 2017
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.