CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	$ 235	$ 839
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	(62)	(130)
Spectrum repack reimbursements	22	72
Proceeds from sale of assets	43	36
Purchases of investments	(244)	(85)
Other, net	10	9
Net cash flows used in investing activities	(231)	(98)
NET CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	357	947
Repayments of notes payable, commercial bank financing and finance leases	(400)	(945)
Repurchase of outstanding Class A Common Stock	0	(343)
Dividends paid on Class A and Class B Common Stock	(46)	(49)
Dividends paid on redeemable subsidiary preferred equity	(4)	(32)
Redemption of redeemable subsidiary preferred equity	0	(547)
Distributions to noncontrolling interests, net	(63)	(19)
Distributions to redeemable noncontrolling interests	(5)	(378)
Increase (decrease) in intercompany payables	0	0
Other, net	(44)	(75)
Net cash flows used in financing activities	(205)	(1,441)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(201)	(700)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	1,262	1,333
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	1,061	633
Reportable Legal Entities \| Sinclair Broadcast Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	8	(115)
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	0	0
Spectrum repack reimbursements	0	0
Proceeds from sale of assets	0	0
Purchases of investments	(7)	(2)
Other, net	0	1
Net cash flows used in investing activities	(7)	(1)
NET CASH FLOWS (USED IN) FROM 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		(343)
Dividends paid on Class A and Class B Common Stock	(46)	(49)
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	57	507
Other, net	(12)	1
Net cash flows used in financing activities	(1)	116
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 FROM (USED IN) OPERATING ACTIVITIES	(100)	(39)
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	(1)	(7)
Spectrum repack reimbursements	0	0
Proceeds from sale of assets	0	0
Purchases of investments	(12)	(30)
Other, net	0	0
Net cash flows used in investing activities	(13)	(37)
NET CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	341	648
Repayments of notes payable, commercial bank financing and finance leases	(356)	(670)
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	226	3
Other, net	(1)	0
Net cash flows used in financing activities	210	(19)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	97	(95)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	458	357
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	555	262
Reportable Legal Entities \| Guarantor Subsidiaries and KDSM, LLC
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	317	481
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	(48)	(110)
Spectrum repack reimbursements	22	72
Proceeds from sale of assets	34	36
Purchases of investments	(40)	(33)
Other, net	(2)	(9)
Net cash flows used in investing activities	(34)	(44)
NET CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	0	0
Repayments of notes payable, commercial bank financing and finance leases	(5)	(3)
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	(268)	(433)
Other, net	0	0
Net cash flows used in financing activities	(273)	(436)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	10	1
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	0	3
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	10	4
Reportable Legal Entities \| Non- Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	6	510
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	(15)	(19)
Spectrum repack reimbursements	0	0
Proceeds from sale of assets	9	0
Purchases of investments	(185)	(20)
Other, net	12	17
Net cash flows used in investing activities	(179)	(22)
NET CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES
Proceeds from notes payable and commercial bank financing	16	299
Repayments of notes payable, commercial bank financing and finance leases	(39)	(272)
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)	(32)
Redemption of redeemable subsidiary preferred equity		(547)
Distributions to noncontrolling interests, net	(63)	(19)
Distributions to redeemable noncontrolling interests	(5)	(378)
Increase (decrease) in intercompany payables	(9)	(69)
Other, net	(31)	(76)
Net cash flows used in financing activities	(135)	(1,094)
NET DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(308)	(606)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	804	973
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	496	367
Eliminations
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	4	2
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Acquisition of property and equipment	2	6
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	6
NET CASH FLOWS (USED IN) FROM 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	(6)	(8)
Other, net	0	0
Net cash flows used in financing activities	(6)	(8)
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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