Segment Information, Products and Services (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Mar. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 29, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)
Segment Reporting [Abstract]
Corporate expenses									$ 15	$ 32	$ 29
Number of reportable segments | Segment									3
Segment Reporting Information [Line Items]
Total net sales	$ 2,771	$ 2,519	$ 2,583	$ 2,371	$ 2,574	$ 2,293	$ 2,385	$ 2,321	$ 10,244	9,573	9,210
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income	276	$ 272	$ 321	$ 251	268	$ 232	$ 294	$ 237	1,120	1,031	958
Gain on sale of the Crestview Aerospace and TCS businesses									42	0	0
Merger and acquisition related expenses									(28)	0	0
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization									241	225	198
Capital Expenditures [Abstract]
Capital Expenditures									232	224	210
Total Assets [Abstract]
Total Assets	13,518				12,729				13,518	12,729	11,865	$ 12,730
Assets held for sale	0				135				0	135	0	138
Assets of discontinued operations	0				306				0	306	481	$ 285
ISR Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									4,441
C&NS [Member]
Segment Reporting Information [Line Items]
Total net sales									3,059
Electronic Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									2,744
Operating Segments [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income									1,106	1,031	958
Operating Segments [Member] | ISR Systems [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income									448	348	362
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization									92	87	80
Capital Expenditures [Abstract]
Capital Expenditures									57	74	83
Total Assets [Abstract]
Total Assets	4,720				4,135				4,720	4,135	4,117
Operating Segments [Member] | C&NS [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income									282	362	298
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization									69	66	63
Capital Expenditures [Abstract]
Capital Expenditures									50	76	51
Total Assets [Abstract]
Total Assets	3,670				3,505				3,670	3,505	3,258
Operating Segments [Member] | Electronic Systems [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income									376	321	298
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization									80	72	55
Capital Expenditures [Abstract]
Capital Expenditures									108	52	66
Total Assets [Abstract]
Total Assets	4,128				3,939				4,128	3,939	3,542
Corporate [Member]
Capital Expenditures [Abstract]
Capital Expenditures									17	22	10
Total Assets [Abstract]
Total Assets	$ 1,000				$ 709				1,000	709	467
Product [Member]
Segment Reporting Information [Line Items]
Total net sales									7,165	6,733	6,453
Product [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									2,907
Product [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Total net sales									2,299
Product [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									1,959
Product [Member] | Operating Segments [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									2,907	2,540	2,662
Product [Member] | Operating Segments [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Total net sales									2,307	2,424	2,238
Product [Member] | Operating Segments [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									2,007	1,814	1,617
Product [Member] | Elimination of Intercompany Sales [Member]
Segment Reporting Information [Line Items]
Total net sales									(56)	(45)	(64)
Service [Member]
Segment Reporting Information [Line Items]
Total net sales									3,079	2,840	2,757
Service [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									1,534
Service [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Total net sales									760
Service [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									785
Service [Member] | Operating Segments [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									1,549	1,463	1,450
Service [Member] | Operating Segments [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Total net sales									787	717	678
Service [Member] | Operating Segments [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Total net sales									789	695	653
Service [Member] | Elimination of Intercompany Sales [Member]
Segment Reporting Information [Line Items]
Total net sales									$ (46)	$ (35)	$ (24)