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Goodwill and Intangible Assets - Changes in Goodwill for Each Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Roll Forward]
Beginning balance	$ 1,831	$ 1,761
Acquisitions		47
Acquisitions	(7)
Other adjustments	6	23
Ending balance	1,830	1,831
Recorded Music
Goodwill [Roll Forward]
Beginning balance	1,367	1,297
Acquisitions		47
Acquisitions	(7)
Other adjustments	6	23
Ending balance	1,366	1,367
Music Publishing
Goodwill [Roll Forward]
Beginning balance	464	464
Acquisitions		0
Acquisitions	0
Other adjustments	0	0
Ending balance	$ 464	$ 464

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
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-Section 55
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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
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X

- Definition

Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Goodwill, Acquired During Period, Including Purchase Accounting Adjustments

+ References

No definition available.

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