EBP, Change in Net Asset Available for Benefit, Notes Receivable Account Balance, Transfer to (from) Plan

No definition available.

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Namespace Prefix:	gd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

EBP, Change in Net Asset Available for Benefit, Participant Account Balance, Transfer to (from) Plan

+ References

No definition available.

+ Details

Name:	gd_EBPChangeInNetAssetAvailableForBenefitParticipantAccountBalanceTransferToFromPlan
Namespace Prefix:	gd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions.

+ References

No definition available.

+ Details

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

- Definition

EBP, Employer Discretionary Contribution Amount

+ References

No definition available.

+ Details

Name:	gd_EBPEmployerDiscretionaryContributionAmount
Namespace Prefix:	gd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

EBP, Minimum Age for Participation in Plan

+ References

No definition available.

+ Details

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Namespace Prefix:	gd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable From Participant, Account, Primary Residence, Borrowing Term

+ References

No definition available.

+ Details

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Namespace Prefix:	gd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term

+ References

No definition available.

+ Details

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

- Definition

EBP, Note Receivable from Participant, Maximum Number of Notes Outstanding

+ References

No definition available.

+ Details

Name:	gd_EBPNoteReceivableFromParticipantMaximumNumberOfNotesOutstanding
Namespace Prefix:	gd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Note Receivable from Participant, Primary Residence, Number of Notes Outstanding

+ References

No definition available.

+ Details

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Namespace Prefix:	gd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	gd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age

+ References

No definition available.

+ Details

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Namespace Prefix:	gd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Loan, Basis Spread On Variable Rate

+ References

No definition available.

+ Details

Name:	gd_EBPParticipantLoanBasisSpreadOnVariableRate
Namespace Prefix:	gd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=gd_EBP006Member
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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- Details

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Plan Description (Details) - EBP 6.0		12 Months Ended
Plan Description (Details) - EBP 6.0	Oct. 01, 2025 USD ($)	Dec. 31, 2025 USD ($) loan year	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Minimum age for participation in plan \| year		18
Automatic enrollment deferral rate		6.00%
Employer matching contribution percentage		100.00%
Employer matched contribution percentage		6.00%
Discretionary contribution amount		$ 11,416,102	$ 11,471,175
Vesting percentage		100.00%
Maximum borrowing, amount		$ 50,000
Maximum borrowing, to total account, percentage		50.00%
Loan repayment period		5 years
Primary residence, borrowing term		20 years
Maximum number of notes outstanding \| loan		2
Primary residence, number of notes outstanding \| loan		1
Basis spread on variable rate		1.00%
Participant account balances transferred	$ 63,754,026
Notes receivable account balances transferred	$ 163,921
Minimum
EBP, Description of Plan [Line Items]
Contribution to eligible compensation, percentage		1.00%
Maximum
EBP, Description of Plan [Line Items]
Contribution to eligible compensation, percentage		75.00%
Vesting period		3 years