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Commitments And Contingencies - Additional Information (Detail) $ in Billions | 3 Months Ended
--- | ---
Apr. 02, 2017 USD ($)
Other Commitments [Line Items] |
Letters of credit and guarantees | $ 1.1
Maximum |
Other Commitments [Line Items] |
Period preceding delivery of aircraft to customer fair market value of trade-in aircraft is established, days, maximum | 45 days

X
- Definition Letters of credit, bank guarantees, surety bonds, and other similar arrangements entered into with financial institutions and insurance carriers. + References No definition available. + Details
Name: | gd_LettersOfCreditAndGuarantees
Namespace Prefix: | gd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Period preceding delivery fair market value established. + References No definition available. + Details
Name: | gd_PeriodPrecedingDeliveryFairMarketValueEstablished
Namespace Prefix: | gd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |