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v3.22.2

Inventory -Narrative (Details) | 6 Months Ended
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Jul. 03, 2022
Inventory Disclosure [Abstract] |
Increase in production of aircraft (in years) | 3 years

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- Definition Inventory, Aircraft, Production Increase, Years + References No definition available. + Details
Name: | gd_InventoryAircraftProductionIncreaseYears
Namespace Prefix: | gd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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