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Unbilled Receivables - Additional Information (Details) - USD ($) $ in Millions | Sep. 28, 2025 | Dec. 31, 2024
--- | --- | ---
Contracts In Process [Line Items] |  |
Net unbilled receivables | $ 8,641 | $ 8,248
Combat Systems | Large International Contract |  |
Contracts In Process [Line Items] |  |
Net unbilled receivables | $ 1,300 | $ 1,200

X
- Definition Contracts In Process [Line Items] + References No definition available. + Details
Name: | gd_ContractsInProcessLineItems
Namespace Prefix: | gd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=gd_CombatSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=gd_LargeInternationalCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |