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Summary of Significant Accounting Policies - Additional Information (Details)	6 Months Ended
	Jul. 03, 2022
Accounting Policies [Line Items]
Length of fiscal quarters, weeks	91 days

X

- Definition

Accounting Policies [Line Items]

+ References

No definition available.

+ Details

Name:	gd_AccountingPoliciesLineItems
Namespace Prefix:	gd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Length of fiscal quarters, weeks

+ References

No definition available.

+ Details

Name:	gd_LengthOfFiscalQuartersWeeks
Namespace Prefix:	gd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration