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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 USD ($)
Statement of Cash Flows [Abstract] |
Payments for clean energy tax credits | $ 71,474

X
- Definition Payments for clean energy tax credits. + References No definition available. + Details
Name: | tgna_PaymentsForCleanEnergyTaxCredits
Namespace Prefix: | tgna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration