v3.25.4
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 12, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-55871    
Entity Registrant Name THE LINCOLN NATIONAL LIFE INSURANCE COMPANY    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 35-0472300    
Entity Address, Address Line One 1301 South Harrison Street    
Entity Address, City or Town Fort Wayne    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 46802    
City Area Code (260)    
Local Phone Number 455 - 2000    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   10,000,000  
Documents Incorporated by Reference None    
Entity Central Index Key 0000726865    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY