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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions			12 Months Ended
	Nov. 30, 2027	Feb. 05, 2025	Sep. 30, 2025
Goodwill [Line Items]
Impairments			$ 4
Finite-lived intangible assets acquired			39
Discontinued Operations, Held-for-Sale
Goodwill [Line Items]
Intangible assets subject to amortization, net			10
Tempo
Goodwill [Line Items]
Percentage of voting interests acquired (as a percent)		50.10%
Final purchase price		$ 77
Net assets acquired		13
Long-term debt fair value		302
Noncontrolling interest, fair value		73
Tempo \| Forecast
Goodwill [Line Items]
Percentage of voting interests acquired (as a percent)	49.90%
Final purchase price	$ 73
Tempo \| Music publishing copyrights
Goodwill [Line Items]
Intangible assets		$ 351
Estimated useful life		15 years
Tempo \| Recorded music catalog
Goodwill [Line Items]
Intangible assets		$ 88
Estimated useful life		15 years
Recorded Music
Goodwill [Line Items]
Impairments			$ 4
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration]			Restructuring & Impairment
Impairment losses on unamortized intangible assets			$ 31