v3.26.3
Retirement and Postretirement Plans - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2026
Sep. 30, 2026
Jun. 30, 2026
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2026
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligations of retirement plans   $ 343,000,000   $ 343,000,000    
Proceeds from life insurance policies       55,000,000 $ 1,000,000  
Contributions by employer   $ 26,000,000   $ 36,000,000    
Projected benefit obligation of the retirement plan, discount rate   5.25%   5.25%    
Fair value of plan assets   $ 324,000,000   $ 324,000,000    
Net noncurrent liability   19,000,000   19,000,000    
Net periodic benefit cost       0    
Forecast [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Expected contributions by employer           $ 0
TEGNA Inc. [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligations of retirement plans   $ 60,000,000   $ 60,000,000    
Proceeds from life insurance policies $ 55,000,000          
TEGNA Inc. [Member] | Other Pension, Postretirement and Supplemental Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation settled     $ 60,000,000