FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details)		3 Months Ended	6 Months Ended
	Nov. 18, 2020 $ / shares	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Apr. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
FAIR VALUE MEASUREMENTS:
Investments in equity securities		$ 550,000,000	$ 550,000,000		$ 400,000,000
Debt discount and deferred financing costs		$ 172,000,000	$ 172,000,000		$ 183,000,000
Term Loan B-3 | STG Term Loan Facility
FAIR VALUE MEASUREMENTS:
Aggregate principal amount				$ 740,000,000
Senior Notes | 5.875% Senior Unsecured Notes due 2026
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.875%	5.875%
Senior Notes | STG 5.500% Unsecured Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.50%	5.50%
Senior Notes | 5.125% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.125%	5.125%
Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		4.125%	4.125%
Senior Notes | DSG 12.750% Secured Notes Due 2026
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		12.75%	12.75%
Senior Notes | DSG 6.625% Unsecured Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		6.625%	6.625%
Senior Notes | DSG 5.375% Secured Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)		5.375%	5.375%
Bally's
FAIR VALUE MEASUREMENTS:
Option purchase price, minimum (in USD per share) | $ / shares	$ 30
Option purchase price, maximum (in USD per share) | $ / shares	$ 45
Precluded from owning more than percentage	4.90%
Bally's | Options and Warrants
FAIR VALUE MEASUREMENTS:
Measurement adjustments		$ (51,000,000)	$ 52,000,000
Discount for lack of marketability		0.20	0.20		0.25
Level 1 | Carrying Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		$ 4,000,000	$ 4,000,000		$ 68,000,000
Deferred compensation assets		48,000,000	48,000,000		42,000,000
Deferred compensation liabilities		41,000,000	41,000,000		36,000,000
Level 1 | Carrying Value | STG Money Market Funds
FAIR VALUE MEASUREMENTS:
Money market funds		527,000,000	527,000,000		448,000,000
Level 1 | Carrying Value | DSG Money Market Funds
FAIR VALUE MEASUREMENTS:
Money market funds		137,000,000	137,000,000		292,000,000
Level 1 | Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		4,000,000	4,000,000		68,000,000
Deferred compensation assets		48,000,000	48,000,000		42,000,000
Deferred compensation liabilities		41,000,000	41,000,000		36,000,000
Level 1 | Fair Value | STG Money Market Funds
FAIR VALUE MEASUREMENTS:
Money market funds		527,000,000	527,000,000		448,000,000
Level 1 | Fair Value | DSG Money Market Funds
FAIR VALUE MEASUREMENTS:
Money market funds		137,000,000	137,000,000		292,000,000
Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		162,000,000	162,000,000		0
Level 2 | Carrying Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		14,000,000	14,000,000		17,000,000
Level 2 | Carrying Value | Debt of non-media subsidiaries
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		17,000,000	17,000,000		17,000,000
Level 2 | Carrying Value | Senior Notes | 5.875% Senior Unsecured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		348,000,000	348,000,000		348,000,000
Level 2 | Carrying Value | Senior Notes | 5.500% Senior Unsecured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		500,000,000	500,000,000		500,000,000
Level 2 | Carrying Value | Senior Notes | 5.125% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		400,000,000	400,000,000		400,000,000
Level 2 | Carrying Value | Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		750,000,000	750,000,000		750,000,000
Level 2 | Carrying Value | Senior Notes | 12.750% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		31,000,000	31,000,000		31,000,000
Level 2 | Carrying Value | Senior Notes | 6.625% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,744,000,000	1,744,000,000		1,744,000,000
Level 2 | Carrying Value | Senior Notes | 5.375% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		3,050,000,000	3,050,000,000		3,050,000,000
Level 2 | Carrying Value | Term Loan | Term Loan B
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		379,000,000	379,000,000		1,119,000,000
Level 2 | Carrying Value | Term Loan | Term Loan B-2
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,277,000,000	1,277,000,000		1,284,000,000
Level 2 | Carrying Value | Term Loan | Term Loan B-3
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		740,000,000	740,000,000		0
Level 2 | Carrying Value | Term Loan | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		3,242,000,000	3,242,000,000		3,259,000,000
Level 2 | Carrying Value | Line of Credit Facility | Accounts Receivable Securitization Facility
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		183,000,000	183,000,000		177,000,000
Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		162,000,000	162,000,000		0
Level 2 | Fair Value | Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		14,000,000	14,000,000		17,000,000
Level 2 | Fair Value | Debt of non-media subsidiaries
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		17,000,000	17,000,000		17,000,000
Level 2 | Fair Value | Senior Notes | 5.875% Senior Unsecured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		358,000,000	358,000,000		358,000,000
Level 2 | Fair Value | Senior Notes | 5.500% Senior Unsecured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		506,000,000	506,000,000		520,000,000
Level 2 | Fair Value | Senior Notes | 5.125% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		402,000,000	402,000,000		408,000,000
Level 2 | Fair Value | Senior Notes | 4.125% Senior Secured Notes due 2030
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		738,000,000	738,000,000		770,000,000
Level 2 | Fair Value | Senior Notes | 12.750% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		27,000,000	27,000,000		28,000,000
Level 2 | Fair Value | Senior Notes | 6.625% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		859,000,000	859,000,000		1,056,000,000
Level 2 | Fair Value | Senior Notes | 5.375% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,971,000,000	1,971,000,000		2,483,000,000
Level 2 | Fair Value | Term Loan | Term Loan B
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		374,000,000	374,000,000		1,107,000,000
Level 2 | Fair Value | Term Loan | Term Loan B-2
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,253,000,000	1,253,000,000		1,264,000,000
Level 2 | Fair Value | Term Loan | Term Loan B-3
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		732,000,000	732,000,000		0
Level 2 | Fair Value | Term Loan | Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		1,929,000,000	1,929,000,000		2,884,000,000
Level 2 | Fair Value | Line of Credit Facility | Accounts Receivable Securitization Facility
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure		183,000,000	183,000,000		177,000,000
Level 3 | Carrying Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		384,000,000	384,000,000		332,000,000
Level 3 | Carrying Value | Options and Warrants
FAIR VALUE MEASUREMENTS:
Measurement adjustments		(51,000,000)	52,000,000
Level 3 | Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities		$ 384,000,000	$ 384,000,000		$ 332,000,000