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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Numerator    
Net income attributable to Warner Music Group Corp. $ 98 $ 120
Class A Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. 19 0
Less: Net income attributable to participating securities (2) 0
Net income attributable to common stockholders $ 17 $ 0
Denominator    
Weighted-average shares outstanding, basic and diluted (in shares) 94,221,946 0
Basic and Diluted EPS (in dollars per share) $ 0.18 $ 0
Class B Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. $ 79 $ 120
Less: Net income attributable to participating securities 0 0
Net income attributable to common stockholders $ 79 $ 120
Denominator    
Weighted-average shares outstanding, basic and diluted (in shares) 416,632,808 501,991,944
Basic and Diluted EPS (in dollars per share) $ 0.19 $ 0.24