NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details)		3 Months Ended		9 Months Ended
	Aug. 23, 2019 USD ($)	Sep. 30, 2020 USD ($) station	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, net		$ 5,747,000,000		$ 5,747,000,000		$ 7,977,000,000
Impairment of goodwill and definite-lived intangible assets		4,264,000,000	$ 0	4,264,000,000	$ 0
Goodwill		2,092,000,000		2,092,000,000		4,716,000,000
Customer relationships, net
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, net		4,384,000,000		4,384,000,000		5,979,000,000
Other definite-lived intangible assets, net
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, net		$ 1,363,000,000		1,363,000,000		$ 1,998,000,000
RSNs
Finite-Lived Intangible Assets [Line Items]
Number of impaired RSNs | station		10
Impairment of goodwill and definite-lived intangible assets		$ 2,615,000,000
Goodwill	$ 2,615,000,000	0		0
RSNs | Customer relationships, net
Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charge on intangible assets		1,218,000,000
Definite-lived intangible assets, net		$ 3,756,000,000		3,756,000,000
Amortization period, weighted average useful life	13 years	11 years
RSNs | Other definite-lived intangible assets, net
Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charge on intangible assets		$ 431,000,000
Definite-lived intangible assets, net		$ 673,000,000		$ 673,000,000
Amortization period, weighted average useful life		11 years
RSNs | Favorable/Unfavorable Contracts With Sports Teams
Finite-Lived Intangible Assets [Line Items]
Amortization period, weighted average useful life	12 years
RSNs | Tradenames/Trademarks
Finite-Lived Intangible Assets [Line Items]
Amortization period, weighted average useful life	2 years