Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 4,463	$ 4,475	$ 4,005
Costs and expenses:
Cost of revenue	(2,333)	(2,401)	(2,171)
Selling, general and administrative expenses	(2,169)	(1,510)	(1,411)
Amortization expense	(190)	(208)	(206)
Total costs and expenses	(4,692)	(4,119)	(3,788)
Operating (loss) income	(229)	356	217
Loss on extinguishment of debt	34	7	31
Interest expense, net	(127)	(142)	(138)
Other (expense) income	(57)	60	394
(Loss) income before income taxes	(447)	267	442
Income tax expense	(23)	(9)	(130)
Net (loss) income	(470)	258	312
Less: Income attributable to noncontrolling interest	(5)	(2)	(5)
Net (loss) income attributable to Warner Music Group Corp.	$ (475)	$ 256	$ 307

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
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-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274