FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details) - USD ($) $ in Millions	Dec. 31, 2019	Nov. 30, 2019	Nov. 27, 2019	Sep. 30, 2019	Aug. 31, 2019	Aug. 02, 2019	Apr. 30, 2019	Dec. 31, 2018
FAIR VALUE MEASUREMENTS:
Unamortized discount and debt issuance costs, net	$ 231							$ 33
Outstanding debt amount	12,631
Level 1 | Carrying Value
FAIR VALUE MEASUREMENTS:
Money market funds	913							961
Deferred compensation assets	36							26
Deferred compensation liabilities	33							24
Level 1 | Fair Value
FAIR VALUE MEASUREMENTS:
Money market funds	913							961
Deferred compensation assets	36							26
Deferred compensation liabilities	33							24
6.125% Senior Unsecured Notes due 2022
FAIR VALUE MEASUREMENTS:
Interest rate		6.125%
5.500% Senior Unsecured Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate		5.50%
5.375% Senior Unsecured Notes due 2021
FAIR VALUE MEASUREMENTS:
Interest rate					5.375%
Term Loan A
FAIR VALUE MEASUREMENTS:
Outstanding debt amount							$ 92
Debt of variable interest entities | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	21							25
Debt of variable interest entities | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	21							25
Debt of non-media subsidiaries | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	18							20
Debt of non-media subsidiaries | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 18							20
Senior Notes | 6.125% Senior Unsecured Notes due 2022
FAIR VALUE MEASUREMENTS:
Interest rate	6.125%	6.125%	6.125%
Outstanding debt amount	$ 0							500
Senior Notes | 6.125% Senior Unsecured Notes due 2022 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	0							$ 500
Interest rate								6.125%
Senior Notes | 6.125% Senior Unsecured Notes due 2022 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 0							$ 504
Senior Notes | 5.875% Senior Unsecured Notes due 2026
FAIR VALUE MEASUREMENTS:
Interest rate	5.88%		5.875%
Outstanding debt amount	$ 350							350
Senior Notes | 5.875% Senior Unsecured Notes due 2026 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	350							$ 350
Interest rate								5.875%
Senior Notes | 5.875% Senior Unsecured Notes due 2026 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 368							$ 326
Senior Notes | 5.625% Senior Unsecured Notes due 2024
FAIR VALUE MEASUREMENTS:
Interest rate	5.63%		5.625%
Outstanding debt amount	$ 550							550
Senior Notes | 5.625% Senior Unsecured Notes due 2024 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	550							$ 550
Interest rate								5.625%
Senior Notes | 5.625% Senior Unsecured Notes due 2024 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 566							$ 516
Senior Notes | 5.500% Senior Unsecured Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate	5.50%		5.50%
Outstanding debt amount	$ 500							0
Senior Notes | 5.500% Senior Unsecured Notes due 2030 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	500							$ 0
Interest rate								5.50%
Senior Notes | 5.500% Senior Unsecured Notes due 2030 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 511							$ 0
Senior Notes | 5.375% Senior Unsecured Notes due 2021
FAIR VALUE MEASUREMENTS:
Interest rate	5.375%				5.375%
Outstanding debt amount	$ 0							600
Senior Notes | 5.375% Senior Unsecured Notes due 2021 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	0							$ 600
Interest rate								5.375%
Senior Notes | 5.375% Senior Unsecured Notes due 2021 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 0							$ 599
Senior Notes | 5.125% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Interest rate	5.13%		5.125%
Outstanding debt amount	$ 400							400
Senior Notes | 5.125% Senior Unsecured Notes due 2027 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	400							$ 400
Interest rate								5.125%
Senior Notes | 5.125% Senior Unsecured Notes due 2027 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 411							$ 353
Senior Notes | 6.625% Senior Unsecured Notes due 2027
FAIR VALUE MEASUREMENTS:
Interest rate	6.63%			6.625%		6.625%
Outstanding debt amount	$ 1,825							0
Senior Notes | 6.625% Senior Unsecured Notes due 2027 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	1,825							0
Senior Notes | 6.625% Senior Unsecured Notes due 2027 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	$ 1,775							0
Senior Notes | 5.375% Senior Secured Notes due 2026
FAIR VALUE MEASUREMENTS:
Interest rate	5.38%			5.375%		5.375%
Outstanding debt amount	$ 3,050							0
Senior Notes | 5.375% Senior Secured Notes due 2026 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	3,050							0
Senior Notes | 5.375% Senior Secured Notes due 2026 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	3,085							0
Term Loan | 5.500% Senior Unsecured Notes due 2030
FAIR VALUE MEASUREMENTS:
Interest rate		5.50%
Term Loan | DSG Term Loan | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	3,292							0
Term Loan | DSG Term Loan | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	3,284							0
STG Term Loan Facility | Term Loan | Term Loan A
FAIR VALUE MEASUREMENTS:
Outstanding debt amount	0							96
STG Term Loan Facility | Term Loan | Term Loan A | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	0							96
STG Term Loan Facility | Term Loan | Term Loan A | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	0							92
STG Term Loan Facility | Term Loan | Term Loan B
FAIR VALUE MEASUREMENTS:
Outstanding debt amount	1,329							1,343
STG Term Loan Facility | Term Loan | Term Loan B | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	1,329							1,343
STG Term Loan Facility | Term Loan | Term Loan B | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	1,326							1,275
STG Term Loan Facility | Term Loan | Term Loan B-2
FAIR VALUE MEASUREMENTS:
Outstanding debt amount	1,297							0
STG Term Loan Facility | Term Loan | Term Loan B-2 | Level 2 | Carrying Value
FAIR VALUE MEASUREMENTS:
Debt instrument	1,297							0
STG Term Loan Facility | Term Loan | Term Loan B-2 | Level 2 | Fair Value
FAIR VALUE MEASUREMENTS:
Debt instrument	1,300							0
Variable Payment Obligations | Level 3 | Carrying Value
FAIR VALUE MEASUREMENTS:
Variable payment obligations	239							0
Variable Payment Obligations | Level 3 | Fair Value
FAIR VALUE MEASUREMENTS:
Variable payment obligations	$ 239							$ 0
Valuation, Income Approach | Measurement Input, Discount Rate | Variable Payment Obligations | Carrying Value
FAIR VALUE MEASUREMENTS:
Variable payment obligations, measurement input	0.09