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Significant Accounting Policies - Additional Information (Detail) |  |  | 3 Months Ended | 8 Months Ended | 12 Months Ended | 16 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 24, 2016 | Nov. 06, 2015 USD ($) | Dec. 31, 2017 USD ($) program $ / shares | Sep. 24, 2017 USD ($) $ / shares | Jun. 25, 2017 USD ($) $ / shares | Mar. 26, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Sep. 25, 2016 USD ($) $ / shares | Jun. 26, 2016 USD ($) $ / shares | Mar. 27, 2016 USD ($) $ / shares | Aug. 23, 2016 | Dec. 31, 2017 USD ($) program $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2017 USD ($) program
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions of businesses and investments in affiliates |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 9,003,000,000 |
Additional charge for performance matter on EADGE-T, gross |  |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  |
Additional charge for performance matter on EADGE-T, after tax |  |  |  |  |  | $ 74,000,000 |  |  |  |  |  |  |  |  |
Additional charge for performance matter on EADGE-T, after tax (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.25 |  |  |  |  |  |  |  |  |
Cumulative losses, including reserves |  |  |  |  |  |  |  |  |  |  |  | 260,000,000 |  |  |
Operating profit |  |  | $ 1,859,000,000 | $ 1,428,000,000 | $ 1,485,000,000 | $ 1,149,000,000 | $ 1,428,000,000 | $ 1,588,000,000 | $ 1,375,000,000 | $ 1,158,000,000 |  | 5,921,000,000 | 5,549,000,000 | 4,712,000,000 |
Net earnings |  |  | $ (642,000,000) | $ 939,000,000 | $ 942,000,000 | $ 763,000,000 | $ 988,000,000 | $ 2,395,000,000 | $ 1,021,000,000 | $ 898,000,000 |  | $ 2,002,000,000 | $ 5,302,000,000 | $ 3,605,000,000 |
Diluted earnings per share (in dollars per share) | $ / shares |  |  | $ (2.25) | $ 3.24 | $ 3.23 | $ 2.61 | $ 3.35 | $ 7.93 | $ 3.32 | $ 2.91 |  | $ 6.89 | $ 17.49 | $ 11.46 |
Service method, revenue recognition interval |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |
Independent research and development costs charged to cost of sales |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 | $ 988,000,000 | $ 817,000,000 |
Financing receivable, significant sales |  |  |  |  |  |  |  |  |  |  |  | 698,000,000 |  |  |
Gain (loss) on sale of accounts receivable |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Depreciation |  |  |  |  |  |  |  |  |  |  |  | 760,000,000 | 747,000,000 | 716,000,000 |
Capitalized internal-use software, net |  |  | $ 424,000,000 |  |  |  | $ 427,000,000 |  |  |  |  | 424,000,000 | 427,000,000 |  | $ 424,000,000
Capitalized internal-use software accumulated amortization |  |  | 2,000,000,000 |  |  |  | 1,900,000,000 |  |  |  |  | 2,000,000,000 | 1,900,000,000 |  | 2,000,000,000
Goodwill |  |  | 10,807,000,000 |  |  |  | 10,764,000,000 |  |  |  |  | $ 10,807,000,000 | 10,764,000,000 | 10,695,000,000 | 10,807,000,000
Weighted average remaining contractual life, vested |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
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 |  |  | 1,400,000,000 |  |  |  | 1,200,000,000 |  |  |  |  | $ 1,400,000,000 | 1,200,000,000 |  | 1,400,000,000
Net gains (losses) on marketable securities |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 66,000,000 | (11,000,000) |
Total equity method investments |  |  | 1,400,000,000 |  |  |  | 1,400,000,000 |  |  |  |  | 1,400,000,000 | 1,400,000,000 |  | 1,400,000,000
Net earnings from equity method investments |  |  |  |  |  |  |  |  |  |  |  | 207,000,000 | 443,000,000 | 320,000,000 |
Equity method investee impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |
ASC 606 | Scenario, Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption, percent increase in current assets |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption, percent increase in current liabilities |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Contracts Accounted for under Percentage of Completion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  |  |  |  | 1,500,000,000 | 1,500,000,000 | 1,700,000,000 |
Net earnings |  |  |  |  |  |  |  |  |  |  |  | $ 980,000,000 | $ 950,000,000 | $ 1,100,000,000 |
Diluted earnings per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 3.37 | $ 3.13 | $ 3.50 |
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 |  |  |
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 |  |  |
Designated as hedges | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives |  |  | 1,200,000,000 |  |  |  | 1,200,000,000 |  |  |  |  | $ 1,200,000,000 | $ 1,200,000,000 |  | 1,200,000,000
Designated as hedges | Foreign currency contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives |  |  | $ 4,100,000,000 |  |  |  | 4,000,000,000 |  |  |  |  | $ 4,100,000,000 | 4,000,000,000 |  | $ 4,100,000,000
Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial satellite programs with performance issues | program |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  | 2
Goodwill |  |  | $ 1,587,000,000 |  |  |  | 1,585,000,000 |  |  |  |  | $ 1,587,000,000 | 1,585,000,000 | $ 1,588,000,000 | $ 1,587,000,000
Net earnings from equity method investments |  |  |  |  |  |  |  |  |  |  |  | $ 205,000,000 | 325,000,000 | 245,000,000 |
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 |  |  |  |  |  |  |  |  |  |  |  | $ 123,000,000 | 136,000,000 | $ 161,000,000 |
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 |  |  |
Operating Profit | Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption, increase (decrease) |  |  | 846,000,000 |  |  |  | 471,000,000 |  |  |  |  | $ 846,000,000 | 471,000,000 |  | 846,000,000
Nonoperating Income (Loss) | Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption, increase (decrease) |  |  | (846,000,000) |  |  |  | $ (471,000,000) |  |  |  |  | $ (846,000,000) | $ (471,000,000) |  | $ (846,000,000)
AWE Management Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned immediately before acquisition | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned subsequent acquisition | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
AWE Management Limited | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sikorsky Aircraft Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions of businesses and investments in affiliates |  | $ 9,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 2,842,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Concentration Risk | Net Sales | AWE Management Limited | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00%
Segment Concentration Risk | Operating profit | AWE Management Limited | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  | 51.00%
Equity Method Investment Risk | Net Sales | AWE Management Limited | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |
Equity Method Investment Risk | Net Earnings | AWE Management Limited | Space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |
LM2100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial satellite cumulative losses on development |  |  | $ 305,000,000 |  |  |  |  |  |  |  |  | $ 305,000,000 |  |  | $ 305,000,000
Commercial satellite losses on development, after tax |  |  |  |  |  |  |  |  |  |  |  | $ 83,000,000 |  |  |
Commercial satellite losses on development, after tax (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.29 |  |  |
Independent research and development costs charged to cost of sales |  |  |  |  |  |  |  |  |  |  |  | $ 135,000,000 |  |  |
AMMROC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investee impairment |  |  |  |  |  | $ 64,000,000 |  |  |  |  |  | $ 64,000,000 |  |  |
Increase in net earnings due to profit rate adjustments |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.14 |  |  |  |  |  |  |  |  |

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