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Earnings per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Numerator    
Net income attributable to Warner Music Group Corp. $ 159 $ 122
Class A Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. 44 34
Less: Net income attributable to participating securities (2) (2)
Net income attributable to common stockholders $ 42 $ 32
Denominator    
Weighted average shares outstanding, basic (in shares) 138,972,000 137,424,000
Weighted average shares outstanding, diluted (in shares) 138,972,000 137,424,000
Basic (in dollars per share) $ 0.30 $ 0.23
Diluted (in dollars per share) $ 0.30 $ 0.23
Class B Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. $ 115 $ 88
Less: Net income attributable to participating securities 0 0
Net income attributable to common stockholders $ 115 $ 88
Denominator    
Weighted average shares outstanding, basic (in shares) 377,490,000 377,650,000
Weighted average shares outstanding, diluted (in shares) 377,490,000 377,650,000
Basic (in dollars per share) $ 0.30 $ 0.23
Diluted (in dollars per share) $ 0.30 $ 0.23