v3.25.0.1
Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Jun. 28, 2024
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 001-34910    
Entity Registrant Name HUNTINGTON INGALLS INDUSTRIES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 90-0607005    
Entity Address, Address Line One 4101 Washington Avenue    
Entity Address, City or Town Newport News    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 23607    
City Area Code 757    
Local Phone Number 380-2000    
Title of 12(b) Security Common Stock    
Trading Symbol HII    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction Flag false    
Entity Shell Company false    
Entity Public Float     $ 9,671
Entity Common Stock, Shares Outstanding   39,130,163  
Document Fiscal Year Focus 2024    
Entity Central Index Key 0001501585    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Amendment Flag false