Segment Information, Sales by Type (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,771	$ 2,519	$ 2,583	$ 2,371	$ 2,574	$ 2,293	$ 2,385	$ 2,321	$ 10,244	$ 9,573	$ 9,210
Direct Sales to End Customer as Percent of Consolidated Sales									64.00%
Indirect Sales as Subcontractor or Supplier as Percent of Consolidated Sales									36.00%
Fixed Price Incentive Fee Type Contracts as Percent of Net Sales									1.00%
Cost-plus and Incentive Fee Type Contracts as Percent of Net Sales									4.00%
Cost Input Method [Member]
Segment Reporting Information [Line Items]
Net sales									$ 7,604
Transferred at Point in Time [Member]
Segment Reporting Information [Line Items]
Net sales									1,930
Output Method [Member]
Segment Reporting Information [Line Items]
Net sales									440
Billing Method [Member]
Segment Reporting Information [Line Items]
Net sales									270
ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									4,441
ISR Systems [Member] | Cost Input Method [Member]
Segment Reporting Information [Line Items]
Net sales									3,352
ISR Systems [Member] | Transferred at Point in Time [Member]
Segment Reporting Information [Line Items]
Net sales									866
ISR Systems [Member] | Output Method [Member]
Segment Reporting Information [Line Items]
Net sales									74
ISR Systems [Member] | Billing Method [Member]
Segment Reporting Information [Line Items]
Net sales									149
C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									3,059
C&NS [Member] | Cost Input Method [Member]
Segment Reporting Information [Line Items]
Net sales									2,603
C&NS [Member] | Transferred at Point in Time [Member]
Segment Reporting Information [Line Items]
Net sales									359
C&NS [Member] | Output Method [Member]
Segment Reporting Information [Line Items]
Net sales									23
C&NS [Member] | Billing Method [Member]
Segment Reporting Information [Line Items]
Net sales									74
Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									2,744
Electronic Systems [Member] | Cost Input Method [Member]
Segment Reporting Information [Line Items]
Net sales									1,649
Electronic Systems [Member] | Transferred at Point in Time [Member]
Segment Reporting Information [Line Items]
Net sales									705
Electronic Systems [Member] | Output Method [Member]
Segment Reporting Information [Line Items]
Net sales									343
Electronic Systems [Member] | Billing Method [Member]
Segment Reporting Information [Line Items]
Net sales									47
Department of Defense [Member]
Segment Reporting Information [Line Items]
Net sales									6,721
Department of Defense [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									3,081
Department of Defense [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									2,291
Department of Defense [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									1,349
Other U.S. Government [Member]
Segment Reporting Information [Line Items]
Net sales									423
Other U.S. Government [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									150
Other U.S. Government [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									95
Other U.S. Government [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									178
Total U. S. Government [Member]
Segment Reporting Information [Line Items]
Net sales									7,144
Total U. S. Government [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									3,231
Total U. S. Government [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									2,386
Total U. S. Government [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									1,527
Foreign Government Debt [Member]
Segment Reporting Information [Line Items]
Net sales									1,528
Foreign Government Debt [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									1,006
Foreign Government Debt [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									327
Foreign Government Debt [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									195
Commercial - Foreign [Member]
Segment Reporting Information [Line Items]
Net sales									873
Commercial - Foreign [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									75
Commercial - Foreign [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									123
Commercial - Foreign [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									675
Commercial - Domestic [Member]
Segment Reporting Information [Line Items]
Net sales									699
Commercial - Domestic [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									129
Commercial - Domestic [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									223
Commercial - Domestic [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									347
Fixed-price Contract [Member]
Segment Reporting Information [Line Items]
Net sales									7,358
Fixed-price Contract [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									2,839
Fixed-price Contract [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									2,202
Fixed-price Contract [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									2,317
Cost-plus Contract [Member]
Segment Reporting Information [Line Items]
Net sales									2,571
Cost-plus Contract [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									1,393
Cost-plus Contract [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									768
Cost-plus Contract [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									410
Time-and-materials Contract [Member]
Segment Reporting Information [Line Items]
Net sales									315
Time-and-materials Contract [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									209
Time-and-materials Contract [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									89
Time-and-materials Contract [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									17
Product [Member]
Segment Reporting Information [Line Items]
Net sales									7,165	6,733	6,453
Product [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									2,907
Product [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									2,299
Product [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									1,959
Service [Member]
Segment Reporting Information [Line Items]
Net sales									3,079	$ 2,840	$ 2,757
Service [Member] | ISR Systems [Member]
Segment Reporting Information [Line Items]
Net sales									1,534
Service [Member] | C&NS [Member]
Segment Reporting Information [Line Items]
Net sales									760
Service [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Net sales									$ 785