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Earnings And Dividends Per Share - Additional Information (Detail) (Stock Options and Restricted Stock [Member])
In Thousands, unless otherwise specified
3 Months Ended
Apr. 05, 2015
Mar. 30, 2014
Stock Options and Restricted Stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 722us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= gd_StockOptionsAndRestrictedStockMember
4,790us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= gd_StockOptionsAndRestrictedStockMember