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Debt - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 27, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Total outstanding principal		$ 6,413		$ 6,413		$ 6,545
Debt Related Commitment Fees and Debt Issuance Costs		10		$ 10	$ 1
Selling General and Administrative Expenses
Debt Instrument [Line Items]
Debt issuance costs		9
Debt Related Commitment Fees and Debt Issuance Costs		9
Term Loan A, due June 2030 [Member]
Debt Instrument [Line Items]
Applicable margin				1.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]				Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Term Loan B, due June 2032 [Member]
Debt Instrument [Line Items]
Applicable margin				2.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]				Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Term Loan A, Due June 2030 and Term Loan B, Due June 2032 [Member]
Debt Instrument [Line Items]
Previous debt discounts and financing costs carried by new debt		9		$ 9
Debt discount and debt issuance costs gross		18		$ 18
Secured Debt [Member]
Debt Instrument [Line Items]
Maximum consolidated first lien net leverage ratio				425.00%
Maximum consolidated first lien net leverage ratio after material transaction				475.00%
Nexstar [Member] | Term Loan A, due June 2027 [Member]
Debt Instrument [Line Items]
Prepayment of principal balance under term loan	$ 2,091
Repayments of Long-term Debt, Total	2,091
Nexstar [Member] | Term Loan B, due September 2026 [Member]
Debt Instrument [Line Items]
Prepayment of principal balance under term loan	1,358
Repayments of Long-term Debt, Total	1,358
Nexstar [Member] | Secured Debt [Member] | Term Loans [Member]
Debt Instrument [Line Items]
Repayment of scheduled maturity of debt				$ 32
Nexstar [Member] | Secured Debt [Member] | Revolving loans, due June 2027 [Member]
Debt Instrument [Line Items]
Available borrowing capacity		586		586
Credit facility outstanding amount		20		20
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2030 [Member]
Debt Instrument [Line Items]
Total outstanding principal		1,905		$ 1,905
Total outstanding principal	$ 1,905
Maturity date	Jun. 27, 2030			Jun. 30, 2030		Jun. 30, 2030
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due June 2032 [Member]
Debt Instrument [Line Items]
Total outstanding principal		1,300		$ 1,300
Total outstanding principal	$ 1,300
Maturity date	Jun. 27, 2032			Jun. 30, 2032		Jun. 30, 2032
Nexstar [Member] | Secured Debt [Member] | Revolving loans, due June 2030 [Member]
Debt Instrument [Line Items]
Total outstanding principal		$ 144		$ 144
Total outstanding principal	$ 750
Total outstanding principal	$ 144
Maturity date	Jun. 27, 2030
Nexstar [Member] | Secured Debt [Member] | Term Loan A, due June 2027 [Member]
Debt Instrument [Line Items]
Total outstanding principal						$ 2,121
Maturity date				Jun. 30, 2027		Jun. 30, 2027
Nexstar [Member] | Secured Debt [Member] | Term Loan B, due September 2026 [Member]
Debt Instrument [Line Items]
Total outstanding principal						$ 1,358
Maturity date				Sep. 30, 2026		Sep. 30, 2026
Nexstar [Member] | Senior Subordinated Notes [Member] | 4.75% Notes, due November 2028 [Member]
Debt Instrument [Line Items]
Interest rate		4.75%		4.75%		4.75%
Total outstanding principal		$ 1,000		$ 1,000		$ 1,000
Maturity date				Nov. 30, 2028		Nov. 30, 2028
Nexstar [Member] | Senior Subordinated Notes [Member] | 5.625% Notes, due July 2027 [Member]
Debt Instrument [Line Items]
Interest rate		5.625%		5.625%		5.625%
Total outstanding principal		$ 1,714		$ 1,714		$ 1,714
Maturity date				Jul. 31, 2027		Jul. 31, 2027
Nexstar [Member] | Senior Subordinated Notes [Member] | Revolving loans, due June 2030 [Member]
Debt Instrument [Line Items]
Maturity date				Jun. 30, 2030		Jun. 30, 2030
Mission [Member] | Revolving loans, due June 2027 [Member]
Debt Instrument [Line Items]
Prepayment of principal balance under term loan	$ 62
Repayments of Long-term Debt, Total	62
Mission [Member] | Secured Debt [Member] | Revolving loans, due June 2027 [Member]
Debt Instrument [Line Items]
Available borrowing capacity		14		$ 14
Total outstanding principal						$ 62
Maturity date				Jun. 30, 2027		Jun. 30, 2027
Mission [Member] | Secured Debt [Member] | Revolving loans, due June 2030 [Member]
Debt Instrument [Line Items]
Total outstanding principal		$ 62		$ 62
Total outstanding principal	75
Total outstanding principal	$ 62
Maturity date	Jun. 27, 2030			Jun. 30, 2030		Jun. 30, 2030

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