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Summary of Financial Information for Each Business Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 25, 2016 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total net sales |  | $ 11,551 | $ 10,060 | $ 33,496 | $ 29,016 |
Less: CAS pension cost | [1] | 482 | 382 | 1,430 | 1,146 |
FAS/CAS pension adjustment | [1] | 226 | 102 | 672 | 305 |
Stock-based compensation |  | (28) | (27) | (124) | (112) |
Severance charges |  |  | (15) | (80) | (15) |
Other, net |  | (33) | (112) | (157) | (264) |
Total unallocated items |  | 165 | (52) | 311 | (86) |
Operating profit |  | 1,588 | 1,192 | 4,121 | 3,612 |
Total assets |  | 48,739 |  | 48,739 |  | $ 49,304
Discontinued Operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total assets |  |  |  |  |  | 4,130
Qualified defined benefit pension plans |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
FAS pension expense | [1] | (256) | (280) | (758) | (841) |
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit |  | 1,423 | 1,244 | 3,810 | 3,698 |
Total assets |  | 36,336 |  | 36,336 |  | 34,693
Operating Segments | Aeronautics |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total net sales |  | 4,188 | 3,921 | 12,362 | 11,186 |
Operating profit |  | 437 | 418 | 1,335 | 1,233 |
Total assets |  | 8,012 |  | 8,012 |  | 6,618
Operating Segments | Missiles and Fire Control |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total net sales |  | 1,737 | 1,769 | 4,851 | 4,801 |
Operating profit |  | 289 | 316 | 763 | 895 |
Total assets |  | 3,950 |  | 3,950 |  | 4,027
Operating Segments | Rotary and Mission Systems |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total net sales |  | 3,346 | 2,162 | 9,653 | 6,306 |
Operating profit |  | 247 | 245 | 678 | 687 |
Total assets |  | 18,978 |  | 18,978 |  | 19,187
Operating Segments | Space Systems |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total net sales |  | 2,280 | 2,208 | 6,630 | 6,723 |
Operating profit |  | 450 | 265 | 1,034 | 883 |
Total assets |  | 5,396 |  | 5,396 |  | 4,861
Intersegment elimination |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total intersegment sales |  | 601 | 511 | 1,802 | 1,483 |
Intersegment elimination | Aeronautics |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total intersegment sales |  | 30 | 22 | 105 | 68 |
Intersegment elimination | Missiles and Fire Control |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total intersegment sales |  | 81 | 86 | 225 | 241 |
Intersegment elimination | Rotary and Mission Systems |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total intersegment sales |  | 469 | 364 | 1,382 | 1,066 |
Intersegment elimination | Space Systems |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total intersegment sales |  | 21 | $ 39 | 90 | $ 108 |
Corporate |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total assets | [2] | $ 12,403 |  | $ 12,403 |  | $ 10,481
[1] | FAS pension expense and CAS pension costs reflect the reclassification for discontinued operations presentation of benefits related to former IS&GS salaried employees (See Note 7).
[2] | 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.

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