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Summary of Financial Information for Each Business Segment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 27, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 29, 2015
Segment Reporting Information [Line Items]        
Total net sales $ 11,702     $ 10,111
Less: CAS pension cost 500     403
FAS/CAS pension adjustment 246     119
Stock-based compensation (44)     (40)
Severance charges (99) $ (102) $ (102)  
Other, net (29)     (29)
Total unallocated items 74     50
Operating profit 1,297     1,356
Total assets 50,158 49,128    
Qualified defined benefit pension plans        
Segment Reporting Information [Line Items]        
FAS pension expense (254)     (284)
Aeronautics        
Segment Reporting Information [Line Items]        
Severance charges (80)      
Information Systems & Global Solutions        
Segment Reporting Information [Line Items]        
Severance charges (19) (35) (35)  
Mission Systems and Training        
Segment Reporting Information [Line Items]        
Severance charges   (67) $ (67)  
Goodwill by Segment        
Segment Reporting Information [Line Items]        
Operating profit 1,223     1,306
Total assets 39,438 38,899    
Goodwill by Segment | Aeronautics        
Segment Reporting Information [Line Items]        
Total net sales 3,799     3,134
Operating profit 420     371
Total assets 7,070 6,618    
Goodwill by Segment | Information Systems & Global Solutions        
Segment Reporting Information [Line Items]        
Total net sales 1,334     1,390
Operating profit 109     145
Total assets 4,112 4,206    
Goodwill by Segment | Missiles and Fire Control        
Segment Reporting Information [Line Items]        
Total net sales 1,434     1,383
Operating profit 221     286
Total assets 4,038 4,027    
Goodwill by Segment | Mission Systems and Training        
Segment Reporting Information [Line Items]        
Total net sales 3,004     1,979
Operating profit 229     180
Total assets 19,187 19,187    
Goodwill by Segment | Space Systems        
Segment Reporting Information [Line Items]        
Total net sales 2,131     2,225
Operating profit 244     324
Total assets 5,031 4,861    
Intersegment elimination        
Segment Reporting Information [Line Items]        
Total intersegment sales 612     448
Intersegment elimination | Aeronautics        
Segment Reporting Information [Line Items]        
Total intersegment sales 35     20
Intersegment elimination | Information Systems & Global Solutions        
Segment Reporting Information [Line Items]        
Total intersegment sales 24     2
Intersegment elimination | Missiles and Fire Control        
Segment Reporting Information [Line Items]        
Total intersegment sales 75     74
Intersegment elimination | Mission Systems and Training        
Segment Reporting Information [Line Items]        
Total intersegment sales 445     319
Intersegment elimination | Space Systems        
Segment Reporting Information [Line Items]        
Total intersegment sales 33     $ 33
Corporate        
Segment Reporting Information [Line Items]        
Total assets [1] $ 10,720 $ 10,229    
[1] Corporate assets primarily include cash and cash equivalents, deferred income taxes, environmental receivables and investments held in a separate trust to fund certain of our non-qualified deferred compensation plans.