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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Numerator    
Net income attributable to Warner Music Group Corp. $ 187 $ 98
Class A Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. 47 19
Less: Net income attributable to participating securities (2) (2)
Net income attributable to common stockholders $ 45 $ 17
Denominator    
Weighted average shares outstanding, basic (in shares) 123,969,142 94,221,946
Weighted average shares outstanding, diluted (in shares) 123,969,142 94,221,946
Basic (in dollars per share) $ 0.36 $ 0.18
Diluted (in dollars per share) $ 0.36 $ 0.18
Class B Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. $ 140 $ 79
Less: Net income attributable to participating securities 0 0
Net income attributable to common stockholders $ 140 $ 79
Denominator    
Weighted average shares outstanding, basic (in shares) 390,952,038 416,632,808
Weighted average shares outstanding, diluted (in shares) 390,952,038 416,632,808
Basic (in dollars per share) $ 0.36 $ 0.19
Diluted (in dollars per share) $ 0.36 $ 0.19