OTHER ASSETS - Equity Investments and Other Investments (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended
	Nov. 18, 2020	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments			$ 9,000,000	$ (6,000,000)
Investments in equity securities			88,000,000		$ 68,000,000
Fair value adjustment			20,000,000	(1,000,000)
Equity investments, net of cumulative impairment			22,000,000		26,000,000
Cumulative impairment			7,000,000		7,000,000
Impairment recorded			0	0
Incremental investment			49,000,000	25,000,000
Level 3 | Options and Warrants | Carrying Value
Schedule of Equity Method Investments [Line Items]
Options and warrants			435,000,000		$ 332,000,000
YES Network
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments			13,000,000	$ 5,000,000
Bally's
Schedule of Equity Method Investments [Line Items]
Penny warrants acquirable (up to) (in shares)	8.2
Number of penny warrants exercisable (in shares)	3.3
Options available to purchase (up to) (in shares)	1.6
Option purchase price, minimum	$ 30
Option purchase price, maximum	$ 45
Vesting period	4 years
Bally's | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Incremental investment		$ 93,000,000
Number of warrants convertible (in shares)		1.7
Exercise price (in dollars per share)		$ 0.01
Bally's | Options and Warrants
Schedule of Equity Method Investments [Line Items]
Measurement adjustments			$ 103,000,000