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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-41565    
Entity Registrant Name Leonardo DRS, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-2632319    
Entity Address, Address Line One 2345 Crystal Drive    
Entity Address, Address Line Two Suite 1000    
Entity Address, City or Town Arlington    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 22202    
City Area Code 703    
Local Phone Number 416-8000    
Title of 12(b) Security Common stock, $0.01 par value    
Trading Symbol DRS    
Security Exchange Name NASDAQ    
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 false    
Entity Shell Company false    
Entity Public Float     $ 1,875
Entity Common Stock, Shares Outstanding   265,157,699  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of Leonardo DRS, Inc.’s 2025 definitive proxy statement are incorporated by reference into Part III of this Form 10-K. The 2025 definitive proxy statement will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year ended December 31, 2024.
    
Entity CIK 0001833756    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY