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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Numerator    
Net income attributable to Warner Music Group Corp. $ 236 $ 159
Class A Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. 67 44
Less: Net income attributable to participating securities (3) (2)
Net income attributable to common stockholders $ 64 $ 42
Denominator    
Weighted average shares outstanding, basic (in shares) 143,053,000 138,972,000
Weighted average shares outstanding, diluted (in shares) 143,053,000 138,972,000
Basic (in dollars per share) $ 0.45 $ 0.30
Diluted (in dollars per share) $ 0.45 $ 0.30
Class B Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. $ 169 $ 115
Less: Net income attributable to participating securities 0 0
Net income attributable to common stockholders $ 169 $ 115
Denominator    
Weighted average shares outstanding, basic (in shares) 375,380,000 377,490,000
Weighted average shares outstanding, diluted (in shares) 375,380,000 377,490,000
Basic (in dollars per share) $ 0.45 $ 0.30
Diluted (in dollars per share) $ 0.45 $ 0.30