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DEBT - Narrative (Details) £ in Millions, $ in Millions		1 Months Ended		3 Months Ended							9 Months Ended
DEBT - Narrative (Details) £ in Millions, $ in Millions	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Mar. 30, 2026	Sep. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 GBP (£)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 30, 2026	Dec. 30, 2025	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2026	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2024 EUR (€)
Debt Instrument [Line Items]
Cash tender offer, aggregate purchase price					$ 14,600
Borrowings from debt, net of discount and issuance costs													$ 18,306	$ 1,617
Gain on extinguishment of debt					(1)		$ 23						2,953	590
Payments to acquire notes receivable									$ 2,610
WarnerMedia
Debt Instrument [Line Items]
Debt assumed					192								192
Senior Notes
Debt Instrument [Line Items]
Senior notes amount repurchased	$ 17,700	$ 17,700	$ 3,399		59		361		$ 3,399	$ 364			59	$ 361
Amount purchased of aggregate principal outstanding senior notes					2								$ 2
Gain on extinguishment of debt		3,000	$ 542
Payments for consent solicitations		293
Bridge loan with maturity of 15 months \| Term Loan
Debt Instrument [Line Items]
Principal repayments of term loans					1,000
Debt instrument, maturity term													15 months
Senior Notes Due July 2025 \| Senior Notes
Debt Instrument [Line Items]
Principal repayments of term loans					$ 97
Unsecured Senior Term Loan \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, maturity term					364 days	364 days
Proceeds from short-term debt						$ 1,500
Unsecured Senior Term Loan \| Unsecured Debt \| Discovery Global Holdings, Inc
Debt Instrument [Line Items]
Face amount					$ 1,500								$ 1,500
Debt instrument, maturity term					364 days
Bridge Loan Facility \| Bridge Loan \| Forecast
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate				3.50%							4.00%	3.00%
Fee rate															0.75%	0.75%	0.50%	0.50%	0.30%
Bridge Loan Facility \| Bridge Loan \| Discovery Global Holdings, Inc
Debt Instrument [Line Items]
Borrowings from debt, net of discount and issuance costs	$ 17,000
Senior Notes Due June 2025 \| Senior Notes
Debt Instrument [Line Items]
Principal repayments of term loans		$ 487
Senior Notes Due March 2025
Debt Instrument [Line Items]
Aggregate principal amount						1,500
Senior Notes Due March 2025 \| Senior Notes
Debt Instrument [Line Items]
Principal repayments of term loans						$ 2,165
Senior Notes Due September 2024 \| Senior Notes
Debt Instrument [Line Items]
Principal repayments of term loans							$ 529	£ 400
Senior Notes Due 2024, 3.900% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			3.90%						3.90%											3.90%
Senior Notes Due 2055, 4.000% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			4.00%						4.00%											4.00%
Senior Notes Due 2050, 4.650% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			4.65%						4.65%											4.65%
Senior Notes Due 2042, 4.950% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			4.95%						4.95%											4.95%
Senior Notes Due 2043, 4.875% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			4.875%						4.875%											4.875%
Senior Notes Due 2047, 5.200% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			5.20%						5.20%											5.20%
Senior Notes Due 2049, 5.300% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			5.30%						5.30%											5.30%
Senior Notes Due 2044, 4.650% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			4.65%						4.65%											4.65%
Senior Notes Due 2045, 4.850% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			4.85%						4.85%											4.85%
Senior Notes Due 2042, 4.900% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			4.90%						4.90%											4.90%
Senior Notes Due 2043, 5.350% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			5.35%						5.35%											5.35%
Senior Notes Due 2042, 5.050% \| Senior Notes \| Discovery Communications, LLC
Debt Instrument [Line Items]
Weighted average interest rate			5.05%						5.05%											5.05%
Senior Notes Due June 2024 \| Senior Notes
Debt Instrument [Line Items]
Principal repayments of term loans			$ 48
4.302% Senior Notes due 2030 \| Senior Notes
Debt Instrument [Line Items]
Face amount \| €																				€ 650,000,000
Weighted average interest rate			4.302%						4.302%											4.302%
4.693% Senior Notes due 2033 \| Senior Notes
Debt Instrument [Line Items]
Face amount \| €																				€ 850,000,000
Weighted average interest rate			4.693%						4.693%											4.693%
Senior Notes Due February And March 2024 \| Senior Notes
Debt Instrument [Line Items]
Principal repayments of term loans										$ 726