Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,425,933,543
Entity Common Stock, Shares Outstanding		219,656,092
Documents Incorporated by Reference	Portions of our 2021 definitive proxy statement are incorporated by reference into Part III of this Form 10-K. The 2021 definitive proxy statement will be filed with the U.S. Securities and Exchange Commission within 120 days of our fiscal year ended December 31, 2020.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000039899