Debt - Long Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Long term Debt [Abstract]
Total outstanding principal	$ 6,514	$ 6,545
Total outstanding debt	6,495	6,523
Less: current portion	(124)	(124)
Long-term debt, net of current portion	6,371	6,399
Nexstar [Member] \| Secured Debt [Member] \| Term Loan A, due June 2027 [Member]
Long term Debt [Abstract]
Total outstanding principal	2,091	2,121
Unamortized financing costs and (discount) premium	(3)	(4)
Nexstar [Member] \| Secured Debt [Member] \| Term Loan B, due September 2026 [Member]
Long term Debt [Abstract]
Total outstanding principal	1,358	1,358
Unamortized financing costs and (discount) premium	(12)	(14)
Nexstar [Member] \| Senior Subordinated Notes [Member] \| 5.625% Notes, due July 2027 [Member]
Long term Debt [Abstract]
Total outstanding principal	1,714	1,714
Unamortized financing costs and (discount) premium	2	2
Nexstar [Member] \| Senior Subordinated Notes [Member] \| 4.75% Notes, due November 2028 [Member]
Long term Debt [Abstract]
Total outstanding principal	1,000	1,000
Unamortized financing costs and (discount) premium	(5)	(5)
Mission [Member]
Long term Debt [Abstract]
Less: current portion	(3)	(3)
Long-term debt, net of current portion	347	348
Mission [Member] \| Secured Debt [Member] \| Term Loan B, due June 2028 [Member]
Long term Debt [Abstract]
Total outstanding principal	289	290
Unamortized financing costs and (discount) premium	(1)	(1)
Mission [Member] \| Secured Debt [Member] \| Revolving loans, due June 2027 [Member]
Long term Debt [Abstract]
Total outstanding principal	$ 62	$ 62

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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