FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of Notes and Debentures (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value	$ 141	$ 223
Debt discount and deferred financing costs	$ 53	55
STG Second Lien Secured Notes 9.750 Percent Due 2033 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	9.75%
STG Senior Unsecured Notes 8.125 Percent Due 2027 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	8.125%
5.500% Senior Notes due 2030 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	5.50%
STG Second-Out First Lien Secured Notes 4.375 Percent due 2032 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	4.375%
STG 4.125% Unsecured Notes due 2030 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Interest rate (as a percent)	4.125%
Level 1 \| Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value	$ 34	40
Level 1 \| Fair Value \| Money market funds
FAIR VALUE MEASUREMENTS:
Money market funds	522	678
Level 2 \| Face Value \| STG Second Lien Secured Notes 9.750 Percent Due 2033 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	432	432
Level 2 \| Face Value \| STG Senior Unsecured Notes 8.125 Percent Due 2027 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	1,430	1,430
Level 2 \| Face Value \| 5.500% Senior Notes due 2030 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	485	485
Level 2 \| Face Value \| STG Second-Out First Lien Secured Notes 4.375 Percent due 2032 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	238	238
Level 2 \| Face Value \| STG 4.125% Unsecured Notes due 2030 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	4	4
Level 2 \| Face Value \| Term Loan B-3, due April 1, 2028 \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	3	3
Level 2 \| Face Value \| Term Loan B-6, due December 31, 2029 \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	704	706
Level 2 \| Face Value \| Term Loan B-7, due December 31, 2030 \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	724	726
Level 2 \| Face Value \| AR Facility \| Line of Credit \| A/R Facility
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	375	375
Level 2 \| Face Value \| Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	2	6
Level 2 \| Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value	105	181
Deferred compensation assets	50	52
Deferred compensation liabilities	45	48
Level 2 \| Fair Value \| STG Second Lien Secured Notes 9.750 Percent Due 2033 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	477	474
Level 2 \| Fair Value \| STG Senior Unsecured Notes 8.125 Percent Due 2027 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	1,454	1,496
Level 2 \| Fair Value \| 5.500% Senior Notes due 2030 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	420	440
Level 2 \| Fair Value \| STG Second-Out First Lien Secured Notes 4.375 Percent due 2032 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	184	189
Level 2 \| Fair Value \| STG 4.125% Unsecured Notes due 2030 \| Senior Notes
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	3	3
Level 2 \| Fair Value \| Term Loan B-3, due April 1, 2028 \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	2	2
Level 2 \| Fair Value \| Term Loan B-6, due December 31, 2029 \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	630	642
Level 2 \| Fair Value \| Term Loan B-7, due December 31, 2030 \| Term Loan
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	554	653
Level 2 \| Fair Value \| AR Facility \| Line of Credit \| A/R Facility
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	375	375
Level 2 \| Fair Value \| Debt of variable interest entities
FAIR VALUE MEASUREMENTS:
Debt fair value disclosure	2	6
Level 3 \| Fair Value
FAIR VALUE MEASUREMENTS:
Investments in equity securities measured at fair value	$ 2	$ 2

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