CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Statement of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS (USED IN) FROM OPERATING ACTIVITIES	$ (12)	$ 334
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	(38)	(97)
Acquisition of businesses, net of cash acquired	0
Spectrum repack reimbursements	18	52
Proceeds from sale of assets	39	18
Purchases of investments	(164)	(48)
Other, net	4	4
Net cash flows used in investing activities	(141)	(71)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	357	873
Repayments of notes payable, commercial bank financing and finance leases	(385)	(928)
Repurchase of outstanding Class A Common Stock	0	(261)
Dividends paid on Class A and Class B Common Stock	(30)	(35)
Dividends paid on redeemable subsidiary preferred equity	(4)	(24)
Redemption of redeemable subsidiary preferred equity	0	(198)
Distributions to noncontrolling interests, net	(50)	(7)
Distributions to redeemable noncontrolling interests	(5)	(378)
Increase (decrease) in intercompany payables	0	0
Other, net	(24)	(16)
Net cash flows used in financing activities	(141)	(974)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(294)	(711)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	1,262	1,333
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	968	622
Reportable Legal Entities \| Sinclair Broadcast Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS (USED IN) FROM OPERATING ACTIVITIES	(11)	(124)
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	0	0
Acquisition of businesses, net of cash acquired	0
Spectrum repack reimbursements	0	0
Proceeds from sale of assets	0	0
Purchases of investments	(6)	(1)
Other, net	0	1
Net cash flows used in investing activities	(6)	0
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	0	0
Repayments of notes payable, commercial bank financing and finance leases	0	0
Repurchase of outstanding Class A Common Stock		(261)
Dividends paid on Class A and Class B Common Stock	(30)	(35)
Dividends paid on redeemable subsidiary preferred equity	0	0
Redemption of redeemable subsidiary preferred equity		0
Distributions to noncontrolling interests, net	0	0
Distributions to redeemable noncontrolling interests	0	0
Increase (decrease) in intercompany payables	62	420
Other, net	(15)	0
Net cash flows used in financing activities	17	124
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	0	0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	0	0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	0	0
Reportable Legal Entities \| Sinclair Television Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS (USED IN) FROM OPERATING ACTIVITIES	(72)	(98)
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	0	(6)
Acquisition of businesses, net of cash acquired	0
Spectrum repack reimbursements	0	0
Proceeds from sale of assets	0	0
Purchases of investments	(10)	(5)
Other, net	0	0
Net cash flows used in investing activities	(10)	(11)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	341	648
Repayments of notes payable, commercial bank financing and finance leases	(352)	(663)
Repurchase of outstanding Class A Common Stock		0
Dividends paid on Class A and Class B Common Stock	0	0
Dividends paid on redeemable subsidiary preferred equity	0	0
Redemption of redeemable subsidiary preferred equity		0
Distributions to noncontrolling interests, net	0	0
Distributions to redeemable noncontrolling interests	0	0
Increase (decrease) in intercompany payables	173	(65)
Other, net	(1)	0
Net cash flows used in financing activities	161	(80)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	79	(189)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	458	357
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	537	168
Reportable Legal Entities \| Guarantor Subsidiaries and KDSM, LLC
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS (USED IN) FROM OPERATING ACTIVITIES	337	313
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	(27)	(83)
Acquisition of businesses, net of cash acquired	(2)
Spectrum repack reimbursements	18	52
Proceeds from sale of assets	30	18
Purchases of investments	(25)	(22)
Other, net	(1)	(8)
Net cash flows used in investing activities	(7)	(43)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	0	0
Repayments of notes payable, commercial bank financing and finance leases	(3)	(2)
Repurchase of outstanding Class A Common Stock		0
Dividends paid on Class A and Class B Common Stock	0	0
Dividends paid on redeemable subsidiary preferred equity	0	0
Redemption of redeemable subsidiary preferred equity		0
Distributions to noncontrolling interests, net	0	0
Distributions to redeemable noncontrolling interests	0	0
Increase (decrease) in intercompany payables	(324)	(268)
Other, net	0	0
Net cash flows used in financing activities	(327)	(270)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	3	0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	0	3
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	3	3
Reportable Legal Entities \| Non- Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS (USED IN) FROM OPERATING ACTIVITIES	(268)	243
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	(13)	(13)
Acquisition of businesses, net of cash acquired	0
Spectrum repack reimbursements	0	0
Proceeds from sale of assets	9	0
Purchases of investments	(123)	(20)
Other, net	7	11
Net cash flows used in investing activities	(120)	(22)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	16	225
Repayments of notes payable, commercial bank financing and finance leases	(30)	(263)
Repurchase of outstanding Class A Common Stock		0
Dividends paid on Class A and Class B Common Stock	0	0
Dividends paid on redeemable subsidiary preferred equity	(4)	(24)
Redemption of redeemable subsidiary preferred equity		(198)
Distributions to noncontrolling interests, net	(50)	(7)
Distributions to redeemable noncontrolling interests	(5)	(378)
Increase (decrease) in intercompany payables	93	(82)
Other, net	(8)	(16)
Net cash flows used in financing activities	12	(743)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(376)	(522)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	804	973
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	428	451
Eliminations
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS (USED IN) FROM OPERATING ACTIVITIES	2	0
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	2	5
Acquisition of businesses, net of cash acquired	0
Spectrum repack reimbursements	0	0
Proceeds from sale of assets	0	0
Purchases of investments	0	0
Other, net	0	0
Net cash flows used in investing activities	2	5
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	0	0
Repayments of notes payable, commercial bank financing and finance leases	0	0
Repurchase of outstanding Class A Common Stock		0
Dividends paid on Class A and Class B Common Stock	0	0
Dividends paid on redeemable subsidiary preferred equity	0	0
Redemption of redeemable subsidiary preferred equity		0
Distributions to noncontrolling interests, net	0	0
Distributions to redeemable noncontrolling interests	0	0
Increase (decrease) in intercompany payables	(4)	(5)
Other, net	0	0
Net cash flows used in financing activities	(4)	(5)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	0	0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	0	0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	$ 0	$ 0

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