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Earnings Per Share - Schedule of Earnings per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income attributable to Warner Music Group Corp.	$ (475)	$ 256	$ 307
Common Class A
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income attributable to Warner Music Group Corp.	(21)	0	0
Less: Net income attributable to participating securities	(1)	0	0
Net (loss) income attributable to common stockholders	$ (22)	$ 0	$ 0
Weighted average common shares (in shares)	26,897,115	0	0
Earnings per share, basic and diluted (in usd per share)	$ (0.82)	$ 0	$ 0
Common Class B
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net (loss) income attributable to Warner Music Group Corp.	$ (454)	$ 256	$ 307
Less: Net income attributable to participating securities	0	0	0
Net (loss) income attributable to common stockholders	$ (454)	$ 256	$ 307
Weighted average common shares (in shares)	477,624,846	501,991,944	502,630,835
Earnings per share, basic and diluted (in usd per share)	$ (0.95)	$ 0.51	$ 0.61

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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