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Commitments And Contingencies - Additional Information (Details) $ in Billions	6 Months Ended
	Jul. 01, 2018 USD ($)
Other Commitments [Line Items]
Letters of credit and guarantees	$ 1.5
Maximum
Other Commitments [Line Items]
Period preceding delivery of aircraft to customer fair market value of trade-in aircraft is established, days, maximum	45 days

X

- Definition

Letters of credit, bank guarantees, surety bonds, and other similar arrangements entered into with financial institutions and insurance carriers.

+ References

No definition available.

+ Details

Name:	gd_LettersOfCreditAndGuarantees
Namespace Prefix:	gd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Period preceding delivery fair market value established.

+ References

No definition available.

+ Details

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

X

- 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

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: