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Organization and Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 31, 2020 USD ($) $ / shares | Jun. 27, 2021 USD ($) $ / shares | Jun. 28, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2021 USD ($) contract | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2021 USD ($) retiree | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  | 4 |  |  | 4 |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of contract types | contract |  |  |  |  |  |  | 3 |  |  |  |
Ending backlog |  |  |  | $ 135,400 | $ 135,400 | $ 135,400 | $ 135,400 | $ 135,400 | $ 135,400 |  |
Performance obligation satisfied in previous period |  |  |  |  | 2,200 |  |  |  |  | $ 2,000 | $ 2,200
Independent research and development costs charged to cost of sales |  |  |  |  | 1,500 |  |  |  |  | 1,300 | 1,300
Depreciation |  |  |  |  | 904 |  |  |  |  | 853 | 794
Capitalized internal-use software, net |  |  |  | 777 | 777 | 777 | 777 | 777 | 777 | 686 |
Capitalized internal-use software accumulated amortization |  |  |  | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,300 | 2,200 |
Capitalized internal-use software amortization |  |  |  |  | 175 |  |  |  |  | 166 | 111
Goodwill |  |  |  | $ 10,813 | 10,813 | 10,813 | 10,813 | 10,813 | 10,813 | 10,806 | 10,604
Time period environmental costs and recovery of environmental costs are projected over |  |  |  | 20 years |  |  |  |  |  |  |
Fair value of trading securities |  |  |  | $ 2,100 | 2,100 | 2,100 | 2,100 | 2,100 | 2,100 | 2,000 |
Net gains (losses) on marketable securities |  |  |  |  | 205 |  |  |  |  | 231 | 233
Carrying amount of investments held in Lockheed martin venture fund |  |  |  | 465 | 465 | 465 | 465 | $ 465 | 465 | 173 |
Realized gain reflected in other non-operating income |  |  |  |  | 265 |  |  |  |  |  |
Realized gain recognized for changes in fair value, net of tax |  |  |  |  | 199 |  |  |  |  |  |
Net of tax, amount per share ( in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.72 |  |  |
Total equity method investments |  |  |  | $ 689 | 689 | $ 689 | $ 689 | $ 689 | $ 689 | 784 |
Net earnings from equity method investments |  |  |  |  | 97 |  |  |  |  | 163 | 154
Equity method investee impairment |  |  |  |  | $ 0 |  |  |  |  | 128 | 0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  |  | Other noncurrent assets | Other noncurrent assets | Other noncurrent assets | Other noncurrent assets | Other noncurrent assets | Other noncurrent assets |  |
Severance and restructuring charges |  |  |  |  | $ 36 |  |  |  |  | 27 | 0
Severance and restructuring costs, after-tax |  |  |  |  | 28 |  |  |  |  | $ 21 |
Severance and restructuring costs, per share, after-tax (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.10 |  | $ 0.08 |
Severance charges |  |  |  |  |  |  |  |  |  | $ 27 |
Severance charges, net of tax |  |  |  |  |  |  |  |  |  | $ 21 |
Severance charges (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.08 |
Restricted Stock Units and Performance Stock Units |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of years over which equity awards vest |  |  |  | 3 years |  |  |  |  |  |  |
Atomic Weapons Establishment |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
AWE generated sales |  |  |  |  | 885 |  |  |  |  | $ 1,400 |
Operating profit |  |  |  |  | 18 |  |  |  |  | 35 |
AMMROC |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total equity method investments | $ 307 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments | 307 |  |  |  |  |  |  |  |  |  |
Equity method investee impairment | 128 |  |  |  |  |  |  |  |  |  |
Equity method investee impairment, net of tax | $ 96 |  |  |  |  |  |  |  |  |  |
Equity method investee impairment (in dollars per share) | $ / shares | $ 0.34 |  |  |  |  |  |  |  |  |  |
Interest rate swaps | Designated as hedges |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives |  |  |  | $ 500 | 500 | $ 500 | $ 500 | $ 500 | $ 500 | 572 |
Foreign currency contracts | Designated as hedges |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives |  |  |  | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 3,400 |
AMMROC |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investee impairment |  |  | $ 128 |  |  |  |  |  |  |  |
Space Systems |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 1,777 | 1,777 | 1,777 | 1,777 | 1,777 | 1,777 | 1,760 | 1,586
Net earnings from equity method investments |  |  |  |  | 67 |  |  |  |  | 135 | 145
Aeronautics |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 187 | 187 | 187 | 187 | 187 | 187 | 187 | 171
RMS |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 6,759 | 6,759 | 6,759 | 6,759 | 6,759 | 6,759 | 6,768 | 6,758
Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 5 years |  |  |  |  |  |  |
Minimum | Customer programs |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 9 years |  |  |  |  |  |  |
Minimum | Buildings |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 10 years |  |  |  |  |  |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 5 years |  |  |  |  |  |  |
Minimum | Capitalized Software |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 2 years |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 20 years |  |  |  |  |  |  |
Maximum | Customer programs |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 20 years |  |  |  |  |  |  |
Maximum | Buildings |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 40 years |  |  |  |  |  |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 15 years |  |  |  |  |  |  |
Maximum | Capitalized Software |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 6 years |  |  |  |  |  |  |
EADGE-T |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative losses on development |  |  |  | $ 260 | 260 | 260 | 260 | 260 | 260 |  |
Classified Fixed-Price Incentive Fee Contract | Aeronautics |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Performance growth costs |  | $ 225 |  |  |  |  |  |  |  |  |
Performance growth costs after tax |  | $ 169 |  |  |  |  |  |  |  |  |
Performance growth costs per share, after-tax (in dollars per share) | $ / shares |  | $ 0.61 |  |  |  |  |  |  |  |  |
Performance growth costs |  |  |  | 225 | 225 | 225 | 225 | 225 | 225 |  |
Classified Fixed-Price Incentive Fee Contract | RMS |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative losses on development |  |  |  | $ 280 | $ 280 | $ 280 | $ 280 | $ 280 | $ 280 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Over the next 12 months |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, percentage |  |  |  | 38.00% | 38.00% | 38.00% | 38.00% | 38.00% | 38.00% |  |
Expected time of satisfaction |  |  |  | 12 months | 12 months | 12 months | 12 months | 12 months | 12 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Over the next 24 months |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, percentage |  |  |  | 60.00% | 60.00% | 60.00% | 60.00% | 60.00% | 60.00% |  |
Expected time of satisfaction |  |  |  | 24 months | 24 months | 24 months | 24 months | 24 months | 24 months |  |
Contracts Accounted for under Percentage of Completion |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in operating profit due to profit rate adjustments |  |  |  |  | $ 2,000 |  |  |  |  | 1,800 | 1,900
Increase in net earnings due to profit rate adjustments |  |  |  |  | $ 1,600 |  |  |  |  | $ 1,500 | $ 1,500
Increase in diluted earnings per common share due to profit rate (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 5.81 |  | $ 5.33 | $ 5.29

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