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Earnings per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator        
Net income attributable to Warner Music Group Corp. $ 139 $ 122 $ 394 $ 278
Class A Common Stock        
Numerator        
Net income attributable to Warner Music Group Corp. 39 34 111 77
Less: Net income attributable to participating securities (a) (2) (2) (5) (4)
Net income attributable to common stockholders $ 37 $ 32 $ 106 $ 73
Denominator        
Weighted average shares outstanding, basic (in shares) 141,568,000 138,290,000 140,531,000 137,990,000
Weighted average shares outstanding, diluted (in shares) 141,568,000 138,290,000 140,531,000 137,990,000
Basic (in dollars per share) $ 0.27 $ 0.23 $ 0.75 $ 0.53
Diluted (in dollars per share) $ 0.27 $ 0.23 $ 0.75 $ 0.53
Class B Common Stock        
Numerator        
Net income attributable to Warner Music Group Corp. $ 100 $ 88 $ 283 $ 201
Less: Net income attributable to participating securities (a) 0 0 0 0
Net income attributable to common stockholders $ 100 $ 88 $ 283 $ 201
Denominator        
Weighted average shares outstanding, basic (in shares) 376,315,000 377,650,000 376,868,000 377,650,000
Weighted average shares outstanding, diluted (in shares) 376,315,000 377,650,000 376,868,000 377,650,000
Basic (in dollars per share) $ 0.27 $ 0.23 $ 0.75 $ 0.53
Diluted (in dollars per share) $ 0.27 $ 0.23 $ 0.75 $ 0.53