Segment Information and Disaggregation of Net Sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Disaggregation of Revenue [Line Items]
Direct sales to end customer as percent of consolidated sales (percent)	63.00%	65.00%
Indirect sales as subcontractor or supplier as percent of consolidated sales (percent)	37.00%	35.00%
Fixed price incentive fee type contracts as percent of net sales (percent)	1.00%	2.00%
Cost-plus and incentive fee type contracts as percent of net sales (percent)	3.00%	4.00%
Total sales	$ 2,700	$ 2,371
ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	1,253	1,016
C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	785	707
Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	662	648
Department of Defense [Member]
Disaggregation of Revenue [Line Items]
Total sales	1,849	1,562
Department of Defense [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	921	726
Department of Defense [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	593	516
Department of Defense [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	335	320
Other U.S. Government [Member]
Disaggregation of Revenue [Line Items]
Total sales	79	93
Other U.S. Government [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	26	30
Other U.S. Government [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	25	27
Other U.S. Government [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	28	36
Total U. S. Government [Member]
Disaggregation of Revenue [Line Items]
Total sales	1,928	1,655
Total U. S. Government [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	947	756
Total U. S. Government [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	618	543
Total U. S. Government [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	363	356
Foreign Government Debt [Member]
Disaggregation of Revenue [Line Items]
Total sales	397	331
Foreign Government Debt [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	254	205
Foreign Government Debt [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	86	83
Foreign Government Debt [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	57	43
Commercial - Foreign [Member]
Disaggregation of Revenue [Line Items]
Total sales	211	217
Commercial - Foreign [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	20	29
Commercial - Foreign [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	31	26
Commercial - Foreign [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	160	162
Commercial - Domestic [Member]
Disaggregation of Revenue [Line Items]
Total sales	164	168
Commercial - Domestic [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	32	26
Commercial - Domestic [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	50	55
Commercial - Domestic [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	82	87
Product [Member]
Disaggregation of Revenue [Line Items]
Total sales	1,932	1,646
Product [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	855	655
Product [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	606	532
Product [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	471	459
Services [Member]
Disaggregation of Revenue [Line Items]
Total sales	768	725
Services [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	398	361
Services [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	179	175
Services [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	191	189
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Total sales	2,030	1,692
Fixed-price Contract [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	908	639
Fixed-price Contract [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	577	506
Fixed-price Contract [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	545	547
Cost-plus Contract [Member]
Disaggregation of Revenue [Line Items]
Total sales	591	596
Cost-plus Contract [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	295	324
Cost-plus Contract [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	189	179
Cost-plus Contract [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	107	93
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Total sales	79	83
Time-and-materials Contract [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	50	53
Time-and-materials Contract [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	19	22
Time-and-materials Contract [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	10	8
Over Time (Cost to Cost Method) [Member]
Disaggregation of Revenue [Line Items]
Total sales	2,045	1,802
Over Time (Cost to Cost Method) [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	981	807
Over Time (Cost to Cost Method) [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	647	576
Over Time (Cost to Cost Method) [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	417	419
Point in Time [Member]
Disaggregation of Revenue [Line Items]
Total sales	503	432
Point in Time [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	225	157
Point in Time [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	115	103
Point in Time [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	163	172
Output Method [Member]
Disaggregation of Revenue [Line Items]
Total sales	96	74
Output Method [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	24	16
Output Method [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	5	7
Output Method [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	67	51
Billing Method [Member]
Disaggregation of Revenue [Line Items]
Total sales	56	63
Billing Method [Member] | ISRS [Member]
Disaggregation of Revenue [Line Items]
Total sales	23	36
Billing Method [Member] | C&NS [Member]
Disaggregation of Revenue [Line Items]
Total sales	18	21
Billing Method [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	$ 15	$ 6