Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Direct sales to end customer as percent of consolidated sales (percent)	64.00%
Indirect sales as subcontractor or supplier as percent of consolidated sales (percent)	36.00%
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)	4.00%		4.00%
Total sales	$ 2,583	$ 2,385	$ 4,954	$ 4,706
Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	812		1,597
Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	741		1,427
Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	554		1,047
Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	476		883
Department of Defense [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	443		860
Other U.S. Government [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	40		79
Total U. S. Government [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	483		939
Foreign Government Debt [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	74		142
Commercial - Foreign [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	177		344
Commercial - Domestic [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	78		172
Product [Member]
Disaggregation of Revenue [Line Items]
Total sales	1,786		3,432
Product [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	578		1,138
Product [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	405		777
Product [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	397		761
Product [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	406		756
Services [Member]
Disaggregation of Revenue [Line Items]
Total sales	797		1,522
Services [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	234		459
Services [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	336		650
Services [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	157		286
Services [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	70		127
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Total sales	1,872		3,564
Fixed-price Contract [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	680		1,344
Fixed-price Contract [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	398		764
Fixed-price Contract [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	403		732
Fixed-price Contract [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	391		724
Cost-plus Contract [Member]
Disaggregation of Revenue [Line Items]
Total sales	626		1,222
Cost-plus Contract [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	118		226
Cost-plus Contract [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	292		561
Cost-plus Contract [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	133		281
Cost-plus Contract [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	83		154
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Total sales	85		168
Time-and-materials Contract [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	14		27
Time-and-materials Contract [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	51		102
Time-and-materials Contract [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	18		34
Time-and-materials Contract [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	2		5
Cost to Cost Method [Member]
Disaggregation of Revenue [Line Items]
Total sales	1,942		3,744
Cost to Cost Method [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	548		1,081
Cost to Cost Method [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	713		1,379
Cost to Cost Method [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	455		845
Cost to Cost Method [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	226		439
Point in Time [Member]
Disaggregation of Revenue [Line Items]
Total sales	484		916
Point in Time [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	175		369
Point in Time [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	11		13
Point in Time [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	76		153
Point in Time [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	222		381
Output Method [Member]
Disaggregation of Revenue [Line Items]
Total sales	88		162
Output Method [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	71		122
Output Method [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	1		1
Output Method [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	5		12
Output Method [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	11		27
Billing Method [Member]
Disaggregation of Revenue [Line Items]
Total sales	69		132
Billing Method [Member] | Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	18		25
Billing Method [Member] | Aerospace Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	16		34
Billing Method [Member] | Communication Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	18		37
Billing Method [Member] | Sensor Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	$ 17		$ 36