Subsidiary Guarantors (Narrative) (Details)	12 Months Ended
Dec. 31, 2018
Subsidiary Guarantors [Abstract]
Parent ownership percentage of subsidiary guarantors	100.00%

Parent's direct and indirect ownership percentage of each subsidiary Guarantor.

No definition available.

Name:	hii_Parentownershippercentageofsubsidiaryguarantors
Namespace Prefix:	hii_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration