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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