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Summary of Financial Information for Each Business Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Total net sales $ 11,643 $ 11,306 $ 21,754 $ 21,956  
Less: CAS pension cost 404 399 807 798  
FAS/CAS pension adjustment 120 85 239 171  
Stock-based compensation (49) (49) (89) (97)  
Other, net (26) (16) (55) (51)  
Total unallocated items 45 20 95 23  
Operating profit 1,445 1,426 2,801 2,858  
Total assets 39,848   39,848   $ 37,073
Qualified defined benefit pension plans          
Segment Reporting Information [Line Items]          
FAS pension expense (284) (314) (568) (627)  
Business segments          
Segment Reporting Information [Line Items]          
Operating profit 1,400 1,406 2,706 2,835  
Total assets 27,729   27,729   26,490
Business segments | Aeronautics          
Segment Reporting Information [Line Items]          
Total net sales 4,131 3,855 7,265 7,241  
Operating profit 444 453 815 846  
Total assets 6,910   6,910   6,021
Business segments | Information Systems & Global Solutions          
Segment Reporting Information [Line Items]          
Total net sales 1,898 1,941 3,767 3,851  
Operating profit 160 175 296 349  
Total assets 6,123   6,123   6,228
Business segments | Missiles and Fire Control          
Segment Reporting Information [Line Items]          
Total net sales 1,777 1,891 3,280 3,758  
Operating profit 303 345 595 703  
Total assets 4,147   4,147   4,050
Business segments | Mission Systems and Training          
Segment Reporting Information [Line Items]          
Total net sales 1,808 1,771 3,459 3,399  
Operating profit 234 185 453 435  
Total assets 6,504   6,504   6,277
Business segments | Space Systems          
Segment Reporting Information [Line Items]          
Total net sales 2,029 1,848 3,983 3,707  
Operating profit 259 248 547 502  
Total assets 4,045   4,045   3,914
Intersegment elimination          
Segment Reporting Information [Line Items]          
Total intersegment sales 688 602 1,303 1,234  
Intersegment elimination | Aeronautics          
Segment Reporting Information [Line Items]          
Total intersegment sales 25 30 44 57  
Intersegment elimination | Information Systems & Global Solutions          
Segment Reporting Information [Line Items]          
Total intersegment sales 180 172 365 348  
Intersegment elimination | Missiles and Fire Control          
Segment Reporting Information [Line Items]          
Total intersegment sales 99 76 189 163  
Intersegment elimination | Mission Systems and Training          
Segment Reporting Information [Line Items]          
Total intersegment sales 353 298 645 613  
Intersegment elimination | Space Systems          
Segment Reporting Information [Line Items]          
Total intersegment sales 31 $ 26 60 $ 53  
Corporate          
Segment Reporting Information [Line Items]          
Total assets [1] $ 12,119   $ 12,119   $ 10,583
[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.