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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.

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