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v3.22.2

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

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- 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

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- 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