Segment Information and Disaggregation of Net Sales (Details) $ in Millions	3 Months Ended
	Mar. 29, 2019 USD ($) Segment	Mar. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Net Sales [Abstract]
Net sales	$ 2,700	$ 2,371
Operating Income [Abstract]
Merger, acquisition and divestiture related expenses and losses	(18)	0
Operating income	293	251
Depreciation and amortization [Abstract]
Depreciation and amortization	58	56
Total Assets:
Total assets	14,263		$ 13,518
ISRS [Member]
Net Sales [Abstract]
Net sales	1,253	1,016
C&NS [Member]
Net Sales [Abstract]
Net sales	785	707
Electronic Systems [Member]
Net Sales [Abstract]
Net sales	662	648
Operating Segments [Member]
Operating Income [Abstract]
Operating income	311	251
Operating Segments [Member] | ISRS [Member]
Net Sales [Abstract]
Net sales	1,259	1,018
Operating Income [Abstract]
Operating income	130	93
Depreciation and amortization [Abstract]
Depreciation and amortization	23	21
Total Assets:
Total assets	4,823		4,749
Operating Segments [Member] | C&NS [Member]
Net Sales [Abstract]
Net sales	793	713
Operating Income [Abstract]
Operating income	84	64
Depreciation and amortization [Abstract]
Depreciation and amortization	16	17
Total Assets:
Total assets	3,991		3,641
Operating Segments [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	670	659
Operating Income [Abstract]
Operating income	97	94
Depreciation and amortization [Abstract]
Depreciation and amortization	19	18
Total Assets:
Total assets	4,257		4,128
Corporate [Member]
Total Assets:
Total assets	1,192		$ 1,000
Elimination of Intercompany Sales [Member]
Net Sales [Abstract]
Net sales	(22)	(19)
Department of Defense [Member]
Net Sales [Abstract]
Net sales	1,849	1,562
Department of Defense [Member] | ISRS [Member]
Net Sales [Abstract]
Net sales	921	726
Department of Defense [Member] | C&NS [Member]
Net Sales [Abstract]
Net sales	593	516
Department of Defense [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	335	320
Other U.S. Government [Member]
Net Sales [Abstract]
Net sales	79	93
Other U.S. Government [Member] | ISRS [Member]
Net Sales [Abstract]
Net sales	26	30
Other U.S. Government [Member] | C&NS [Member]
Net Sales [Abstract]
Net sales	25	27
Other U.S. Government [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	28	36
Total U. S. Government [Member]
Net Sales [Abstract]
Net sales	1,928	1,655
Total U. S. Government [Member] | ISRS [Member]
Net Sales [Abstract]
Net sales	947	756
Total U. S. Government [Member] | C&NS [Member]
Net Sales [Abstract]
Net sales	618	543
Total U. S. Government [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	363	356
Foreign Government Debt [Member]
Net Sales [Abstract]
Net sales	397	331
Foreign Government Debt [Member] | ISRS [Member]
Net Sales [Abstract]
Net sales	254	205
Foreign Government Debt [Member] | C&NS [Member]
Net Sales [Abstract]
Net sales	86	83
Foreign Government Debt [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	57	43
Commercial - Foreign [Member]
Net Sales [Abstract]
Net sales	211	217
Commercial - Foreign [Member] | ISRS [Member]
Net Sales [Abstract]
Net sales	20	29
Commercial - Foreign [Member] | C&NS [Member]
Net Sales [Abstract]
Net sales	31	26
Commercial - Foreign [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	160	162
Commercial - Domestic [Member]
Net Sales [Abstract]
Net sales	164	168
Commercial - Domestic [Member] | ISRS [Member]
Net Sales [Abstract]
Net sales	32	26
Commercial - Domestic [Member] | C&NS [Member]
Net Sales [Abstract]
Net sales	50	55
Commercial - Domestic [Member] | Electronic Systems [Member]
Net Sales [Abstract]
Net sales	$ 82	$ 87