Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions		Sep. 27, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	$ 4,530	$ 4,573
Accumulated Amortization		(2,368)	(2,258)
Net Carrying Amount		2,162	2,315
Contract and program intangible assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1],[2]	3,745	3,776
Accumulated Amortization	[2]	(1,891)	(1,779)
Net Carrying Amount	[2]	1,854	1,997
Trade names and trademarks
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	496	474
Accumulated Amortization		(216)	(195)
Net Carrying Amount		280	279
Technology and software
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	130	164
Accumulated Amortization		(103)	(126)
Net Carrying Amount		27	38
Other intangible assets
Intangible Assets [Line Items]
Gross Carrying Amount	[1]	159	159
Accumulated Amortization		(158)	(158)
Net Carrying Amount		$ 1	$ 1

[1] Changes in gross carrying amounts consist primarily of adjustments for acquired and divested intangible assets and foreign currency translation.

[2] Consists of acquired backlog and probable follow-on work and associated customer relationships.