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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Numerator        
Net income attributable to Warner Music Group Corp. $ 36 $ 96 $ 272 $ 255
Class A Common Stock        
Numerator        
Net income attributable to Warner Music Group Corp. 10 27 78 71
Less: Net income attributable to participating securities 0 (1) (3) (3)
Net income attributable to common stockholders $ 10 $ 26 $ 75 $ 68
Denominator        
Weighted average shares outstanding, basic (in shares) 144,938,000 141,044,000 143,995,000 140,013,000
Weighted average shares outstanding, diluted (in shares) 144,938,000 141,044,000 143,995,000 140,013,000
Basic (in dollars per share) $ 0.07 $ 0.18 $ 0.52 $ 0.49
Diluted (in dollars per share) $ 0.07 $ 0.18 $ 0.52 $ 0.49
Class B Common Stock        
Numerator        
Net income attributable to Warner Music Group Corp. $ 26 $ 69 $ 194 $ 184
Less: Net income attributable to participating securities 0 0 0 0
Net income attributable to common stockholders $ 26 $ 69 $ 194 $ 184
Denominator        
Weighted average shares outstanding, basic (in shares) 375,380,000 376,800,000 375,380,000 377,145,000
Weighted average shares outstanding, diluted (in shares) 375,380,000 376,800,000 375,380,000 377,145,000
Basic (in dollars per share) $ 0.07 $ 0.18 $ 0.52 $ 0.49
Diluted (in dollars per share) $ 0.07 $ 0.18 $ 0.52 $ 0.49