Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

Name:	srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expiration date for purchase of share under share repurchase plan, in YYYY-MM-DD format. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

+ Details

Name:	srt_StockRepurchaseProgramExpirationDate
Namespace Prefix:	srt_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock Repurchase Program, Percent Repurchased

+ References

No definition available.

+ Details

Name:	tgna_StockRepurchaseProgramPercentRepurchased
Namespace Prefix:	tgna_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Treasury stock value acquired not yet have been paid.

+ References

No definition available.

+ Details

Name:	tgna_TreasuryStockValueAcquiredNotYetHaveBeenPaid
Namespace Prefix:	tgna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481549/505-30-45-1

+ Details

Name:	us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481549/505-30-45-1

+ Details

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_ShareRepurchaseProgramAxis=tgna_ThreeHundredAndTwentyFiveMillionAcceleratedShareRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=tgna_December2023ShareRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Share repurchase program (Details) - USD ($) $ / shares in Units, shares in Millions				1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 22, 2024	Nov. 13, 2023	Nov. 09, 2023	Dec. 31, 2023	Sep. 30, 2024	Sep. 30, 2024
325 Million Second Accelerated Share Repurchase
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)			$ 325,000,000
Shares repurchased under share repurchase program (in shares)	4.0	17.3	17.3
Shares repurchased value under share repurchase program		$ 260,000,000
Treasury stock, value, acquired, cost method		$ 260,000,000
Stock repurchase program, percent repurchased		80.00%
Number of shares repurchased (in shares)	4.0	17.3	17.3
December2023 Share Repurchase Program
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)				$ 650,000,000
Shares repurchased under share repurchase program (in shares)					4.8	15.7
Shares repurchased value under share repurchase program					$ 70,100,000	$ 226,000,000
Treasury stock value acquired not yet have been paid					$ 1,000,000
Average price paid per share (in dollar per share)					$ 14.51	$ 14.36
Treasury stock, value, acquired, cost method					$ 70,100,000	$ 226,000,000
Share repurchase program expiration date				Dec. 31, 2025
Number of shares repurchased (in shares)					4.8	15.7