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v3.21.1

OTHER - Severance Charges (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 28, 2021 | Mar. 29, 2020
Accounting Policies [Abstract] |  |
Severance and restructuring costs | $ 36 | $ 0
Severance and restructuring charges, after-tax | $ 28 |
Severance and restructuring charges, after-tax (in dollars per share) | $ 0.10 |

X
- Definition Severance and Restructuring Costs + References No definition available. + Details
Name: | lmt_SeveranceAndRestructuringCosts
Namespace Prefix: | lmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Severance and Restructuring Costs, After-Tax + References No definition available. + Details
Name: | lmt_SeveranceAndRestructuringCostsAfterTax
Namespace Prefix: | lmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Severance and Restructuring Costs, Per Share, After-Tax + References No definition available. + Details
Name: | lmt_SeveranceAndRestructuringCostsPerShareAfterTax
Namespace Prefix: | lmt_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration