Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions		Mar. 29, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	$ 4,584	$ 4,573
Accumulated Amortization		(2,325)	(2,258)
Net Carrying Amount		2,259	2,315
Contract and program intangible assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1],[2]	3,784	3,776
Accumulated Amortization	[2]	(1,839)	(1,779)
Net Carrying Amount	[2]	1,945	1,997
Trade names and trademarks
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	478	474
Accumulated Amortization		(201)	(195)
Net Carrying Amount		277	279
Technology and software
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	164	164
Accumulated Amortization		(128)	(126)
Net Carrying Amount		36	38
Other intangible assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	158	159
Accumulated Amortization		(157)	(158)
Net Carrying Amount		$ 1	$ 1

[1] Changes in gross carrying amounts consist 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.