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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-6961    
Entity Registrant Name TEGNA INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 16-0442930    
Entity Address, Address Line One 8350 Broad Street,    
Entity Address, Address Line Two Suite 2000,    
Entity Address, City or Town Tysons,    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 22102-5151    
City Area Code (703)    
Local Phone Number 873-6600    
Title of 12(b) Security Common Stock, par value $1.00 per share    
Trading Symbol TGNA    
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    
Entity Shell Company false    
Entity Public Float     $ 3,270,838,563
Entity Common Stock, Shares Outstanding   217,815,465  
Documents Incorporated by Reference
The definitive proxy statement relating to the registrant’s Annual Meeting of Shareholders to be held on April 30, 2020, is incorporated by reference in Part III to the extent described therein.
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000039899    
Current Fiscal Year End Date --12-31