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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 24, 2016 | Nov. 06, 2015 | Dec. 31, 2016 | Sep. 25, 2016 | [2],[3] | Jun. 26, 2016 | Mar. 27, 2016 | [4] | Dec. 31, 2015 | Sep. 27, 2015 | Jun. 28, 2015 | Mar. 29, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions of businesses and investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,003 | $ 898
Operating profit |  |  | $ 1,428 | [1],[2] | $ 1,588 | [1] | $ 1,375 | [1] | $ 1,158 | [1] | $ 1,100 | [5],[6] | $ 1,192 | [5] | $ 1,273 | [5] | $ 1,147 | [5] |  | $ 5,549 | 4,712 | 5,012
Net earnings |  |  | $ 988 | [2] | $ 2,395 |  | $ 1,021 |  | $ 898 |  | $ 933 | [6],[7] | $ 865 | [7] | $ 929 | [7] | $ 878 | [7] |  | $ 5,302 | $ 3,605 | $ 3,614
Diluted earnings per share |  |  | $ 3.35 | [2],[8] | $ 7.93 | [8] | $ 3.32 | [8] | $ 2.91 | [8] | $ 3.01 | [6],[8] | $ 2.77 | [8] | $ 2.94 | [8] | $ 2.74 | [8] |  | $ 17.49 | $ 11.46 | $ 11.21
Independent research and development costs charged to cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 988 | $ 817 | $ 733
Number of years over which stock awards vest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Depreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 747 | 716 | 713
Capitalized internal-use software, net |  |  | $ 427 |  |  |  |  |  |  |  | $ 473 |  |  |  |  |  |  |  |  | 427 | 473 |
Capitalized internal-use software accumulated amortization |  |  | 1,900 |  |  |  |  |  |  |  | 1,900 |  |  |  |  |  |  |  |  | $ 1,900 | 1,900 |
Non-cash goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 119 |  |  | 119
Percentage of gains and losses recognition to the extent exciding greater of plan assets or obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Average future service period of employees expected to receive benefits under the plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |
Time period environmental costs and recovery of environmental costs are projected over, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Fair value of trading securities |  |  | 1,200 |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  | $ 1,200 | 1,100 |
Net gains (losses) on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66 | (11) | 65
Total equity method investments |  |  | 1,400 |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |  |  |  | 1,400 | 1,300 |
Net earnings from equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 443 | 320 | 327
Deferred income taxes assets, noncurrent |  |  | 6,625 |  |  |  |  |  |  |  | 6,068 |  |  |  |  |  |  |  |  | 6,625 | 6,068 |
Accounting Standards Update 2016-09 | Restatement Adjustment | Adjustments for New Accounting Principle, Early Adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 152 |  |
Additional income tax benefit, per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  |
Excess income tax benefit from share-based compensation, operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 152 |  |
Accounting Standards Update 2015-17 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes assets, noncurrent |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  | 1,600 |
Deferred income taxes liabilities, noncurrent |  |  |  |  |  |  |  |  |  |  | 140 |  |  |  |  |  |  |  |  |  | 140 |
Accounting Standards Update 2015-17 | Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes assets, current |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  | 1,600 |
Deferred income taxes liabilities, current |  |  |  |  |  |  |  |  |  |  | 140 |  |  |  |  |  |  |  |  |  | 140 |
Contracts Accounted for under Percentage of Completion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 | 1,700 | 1,600
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 950 | $ 1,100 | $ 1,100
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.13 | $ 3.50 | $ 3.41
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Minimum | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Minimum | Customer Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |
Minimum | Technology-Based Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Minimum | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Maximum | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Maximum | Customer Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Maximum | Technology-Based Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Maximum | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Interest rate swaps | Designated as hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives |  |  | 1,200 |  |  |  |  |  |  |  | 1,500 |  |  |  |  |  |  |  |  | $ 1,200 | $ 1,500 |
Foreign currency contracts | Designated as hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives |  |  | $ 4,000 |  |  |  |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |  | 4,000 | 4,100 |
Space Systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings from equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325 | 245 | $ 280
Buildings | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Buildings | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |
Machinery and equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Machinery and equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Capitalized Software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized internal-use software amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 136 | $ 161 | $ 194
Capitalized Software | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Capitalized Software | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |
Sikorsky Aircraft Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions of businesses and investments in affiliates |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage acquired | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AWE Management Limited | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Net sales and operating profit vary from the amounts previously reported on Form 10-Q as a result of our former IS&GS business being classified as discontinued operations in the third quarter of 2016, which is reflected for all periods presented.
[2] | The third quarter of 2016 includes the results of AWE from August 26, 2016, the date we obtained controlling interest, including approximately $103 million in net sales and $104 million in net earnings. Third quarter net earnings includes a non-cash gain on the step acquisition of AWE (see "Note 3 - Acquisitions and Divestitures"). The fourth quarter of 2016 includes the results of AWE for the entire quarter, including approximately $307 million in net sales and $2.9 million in net earnings.
[3] | The third quarter of 2016 includes a net gain of $1.2 billion related to the divestiture of our former IS&GS business.
[4] | The first quarter of 2016 varies from the amounts previously reported on Form 10-Q as a result of adopting ASU No. 2016-09 (see "Note 1 - Significant Accounting Policies").
[5] | AOCL related to postretirement benefit plans is shown net of tax benefits at December 31, 2016, 2015 and 2014 of $6.5 billion, $6.2 billion and $6.4 billion. These tax benefits include amounts recognized on our income tax returns as current deductions and deferred income taxes, which will be recognized on our tax returns in future years. See "Note 9 - Income Taxes" and "Note 11 -Postretirement Plans" for more information on our income taxes and postretirement benefit plans.
[6] | The fourth quarter of 2015 includes the results of Sikorsky since the November 6, 2015 acquisition date through December 31, 2015, including approximately $400 million in net sales and about $45 million in operating loss, inclusive of intangible amortization and adjustments required to account for the acquisition.
[7] | The third and fourth quarters of 2015 include charges for workforce reductions of $15 million and $67 million ($10 million and $44 million after tax). The fourth quarter of 2015 includes a tax benefit of about $71 million due to the retroactive reinstatement of the R&D tax credit in 2015.
[8] | The sum of the quarterly earnings per share amounts do not equal the earnings per share amounts included on our consolidated statements of earnings, primarily due to the timing of our share repurchases during each respective year.

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