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Earnings per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Numerator    
Net income attributable to Warner Music Group Corp. $ 122 $ 187
Class A Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. 34 47
Less: Net income attributable to participating securities (2) (2)
Net income attributable to common stockholders $ 32 $ 45
Denominator    
Weighted average shares outstanding, basic (in shares) 137,424,000 123,969,000
Weighted average shares outstanding, diluted (in shares) 137,424,000 123,969,000
Basic (in dollars per share) $ 0.23 $ 0.36
Diluted (in dollars per share) $ 0.23 $ 0.36
Class B Common Stock    
Numerator    
Net income attributable to Warner Music Group Corp. $ 88 $ 140
Less: Net income attributable to participating securities 0 0
Net income attributable to common stockholders $ 88 $ 140
Denominator    
Weighted average shares outstanding, basic (in shares) 377,650,000 390,952,000
Weighted average shares outstanding, diluted (in shares) 377,650,000 390,952,000
Basic (in dollars per share) $ 0.23 $ 0.36
Diluted (in dollars per share) $ 0.23 $ 0.36