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Inventory -Narrative (Details)	6 Months Ended
	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

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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