Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 29, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			4
Net Sales [Abstract]
Net sales	$ 2,583	$ 2,385	$ 4,954	$ 4,706
Operating Income [Abstract]
Gain on the sale of the Crestview & TCS Businesses	48	0	48	0
Operating income	321	294	572	531
Depreciation and amortization [Abstract]
Depreciation and amortization	60	54	116	106
Total Assets:
Assets held for sale	0		0		$ 138	$ 135
Assets of discontinued operations	0		0		285	306
Total assets	13,530		13,530		$ 12,730	12,729
Electronic Systems [Member]
Net Sales [Abstract]
Net sales	812		1,597
Aerospace Systems [Member]
Net Sales [Abstract]
Net sales	741		1,427
Communication Systems [Member]
Net Sales [Abstract]
Net sales	554		1,047
Sensor Systems [Member]
Net Sales [Abstract]
Net sales	476		883
Operating Segments [Member]
Operating Income [Abstract]
Operating income	273	294	524	531
Operating Segments [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	828	789	1,630	1,549
Operating Income [Abstract]
Operating income	113	103	221	193
Depreciation and amortization [Abstract]
Depreciation and amortization	24	17	43	35
Total Assets:
Total assets	4,990		4,990			4,796
Operating Segments [Member] | Aerospace Systems [Member]
Net Sales [Abstract]
Net sales	751	681	1,450	1,382
Operating Income [Abstract]
Operating income	61	56	118	112
Depreciation and amortization [Abstract]
Depreciation and amortization	12	13	24	24
Total Assets:
Total assets	2,200		2,200			2,014
Operating Segments [Member] | Communication Systems [Member]
Net Sales [Abstract]
Net sales	563	555	1,062	1,098
Operating Income [Abstract]
Operating income	45	84	82	126
Depreciation and amortization [Abstract]
Depreciation and amortization	11	12	24	24
Total Assets:
Total assets	2,142		2,142			2,063
Operating Segments [Member] | Sensor Systems [Member]
Net Sales [Abstract]
Net sales	482	394	894	748
Operating Income [Abstract]
Operating income	54	51	103	100
Depreciation and amortization [Abstract]
Depreciation and amortization	13	12	25	23
Total Assets:
Total assets	2,890		2,890			2,706
Corporate [Member]
Total Assets:
Total assets	1,308		1,308			$ 709
Elimination of Intercompany Sales [Member]
Net Sales [Abstract]
Net sales	(41)	$ (34)	(82)	$ (71)
Department of Defense [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	443		860
Other U.S. Government [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	40		79
Total U. S. Government [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	483		939
Foreign Government Debt [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	74		142
Commercial - Foreign [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	177		344
Commercial - Domestic [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	$ 78		$ 172