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Acquisitions and Divestitures, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Intangible Assets [Line Items]    
Gross Carrying Amount [1] $ 4,578 $ 4,564
Accumulated Amortization (2,121) (1,979)
Net Carrying Amount 2,457 2,585
Contract and Program Intangible Assets    
Intangible Assets [Line Items]    
Gross Carrying Amount [1],[2] 3,777 3,771
Accumulated Amortization [2] (1,656) (1,531)
Net Carrying Amount [2] 2,121 2,240
Trade Names and Trademarks    
Intangible Assets [Line Items]    
Gross Carrying Amount [1] 472 469
Accumulated Amortization (186) (177)
Net Carrying Amount 286 292
Technology and Software    
Intangible Assets [Line Items]    
Gross Carrying Amount [1] 170 165
Accumulated Amortization (122) (116)
Net Carrying Amount 48 49
Other Intangible Assets    
Intangible Assets [Line Items]    
Gross Carrying Amount [1] 159 159
Accumulated Amortization (157) (155)
Net Carrying Amount $ 2 $ 4
[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.