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Fair Value Measurements - Schedule of Estimated Fair Values and Carrying Amounts of Long-term Debt Not Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Nexstar [Member] | Secured Debt [Member] | Revolving loans due June 2030 [Member] | Level 3 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  | $ 144 |
Nexstar [Member] | Secured Debt [Member] | Revolving loans due June 2030 [Member] | Level 3 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [1] | 143 |
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2030 [Member] | Level 2 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  | 1,874 |
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2030 [Member] | Level 2 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [2] | 1,867 |
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2027 [Member] | Level 3 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  |  | $ 2,117
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2027 [Member] | Level 3 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [3] |  | 2,093
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due June 2032 [Member] | Level 2 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  | 1,280 |
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due June 2032 [Member] | Level 2 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [2] | 1,298 |
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due September 2026 [Member] | Level 3 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  |  | 1,344
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due September 2026 [Member] | Level 3 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [3] |  | 1,362
Nexstar [Member] | Senior Subordinated Notes [Member] | 5.625% Notes, due July 2027 [Member] | Level 2 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  | 1,716 | 1,716
Nexstar [Member] | Senior Subordinated Notes [Member] | 5.625% Notes, due July 2027 [Member] | Level 2 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [2] | 1,712 | 1,667
Nexstar [Member] | Senior Subordinated Notes [Member] | 4.75% Notes, due November 2028 [Member] | Level 2 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  | 996 | 995
Nexstar [Member] | Senior Subordinated Notes [Member] | 4.75% Notes, due November 2028 [Member] | Level 2 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [2] | 971 | 930
Mission [Member] | Secured Debt [Member] | Revolving loans due June 2030 [Member] | Level 3 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  | 62 |
Mission [Member] | Secured Debt [Member] | Revolving loans due June 2030 [Member] | Level 3 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [1] | 61 |
Mission [Member] | Secured Debt [Member] | Revolving loans, due June 2027 [Member] | Level 3 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  |  | 62
Mission [Member] | Secured Debt [Member] | Revolving loans, due June 2027 [Member] | Level 3 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [3] |  | 61
Mission [Member] | Secured Debt [Member] | Term Loan B, due June 2028 [Member] | Level 2 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  | 287 |
Mission [Member] | Secured Debt [Member] | Term Loan B, due June 2028 [Member] | Level 2 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [2] | $ 286 |
Mission [Member] | Secured Debt [Member] | Term Loan B, due June 2028 [Member] | Level 3 [Member] | Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt |  |  | 289
Mission [Member] | Secured Debt [Member] | Term Loan B, due June 2028 [Member] | Level 3 [Member] | Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Carrying Amount and Fair Value of Long-term Debt | [3] |  | $ 290
[1] | The fair value is based on the bid price provided by a third-party investment banking firm and is classified as Level 3 in the fair value hierarchy as the debt is not traded (unobservable in the market).
[2] | The fair value is based on the bid price provided by a third-party investment banking firm and is classified as Level 2 in the fair value hierarchy as the bid price is quoted in a major market news service and the investment banking firm stands ready to trade (observable in the market).
[3] | The fair value was estimated based on available borrowing rates for bank loans with similar terms and average maturities. The fair value measurement was considered Level 3, as significant inputs to the fair value calculation are unobservable in the market.

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