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Earnings per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Numerator        
Net income attributable to Warner Music Group Corp. $ 34 $ 92 $ 156 $ 279
Class A Common Stock        
Numerator        
Net income attributable to Warner Music Group Corp. 10 25 43 73
Less: Net income attributable to participating securities (1) (1) (2) (4)
Net income attributable to common stockholders $ 9 $ 24 $ 41 $ 69
Denominator        
Weighted average shares outstanding, basic (in shares) 138,257,000 136,349,000 137,841,000 130,159,000
Weighted average shares outstanding, diluted (in shares) 138,257,000 136,349,000 137,841,000 130,159,000
Basic (in dollars per share) $ 0.06 $ 0.18 $ 0.30 $ 0.53
Diluted (in dollars per share) $ 0.06 $ 0.18 $ 0.30 $ 0.53
Class B Common Stock        
Numerator        
Net income attributable to Warner Music Group Corp. $ 24 $ 67 $ 113 $ 206
Less: Net income attributable to participating securities 0 0 0 0
Net income attributable to common stockholders $ 24 $ 67 $ 113 $ 206
Denominator        
Weighted average shares outstanding, basic (in shares) 377,650,000 378,432,000 377,650,000 384,442,000
Weighted average shares outstanding, diluted (in shares) 377,650,000 378,432,000 377,650,000 384,442,000
Basic (in dollars per share) $ 0.06 $ 0.18 $ 0.30 $ 0.53
Diluted (in dollars per share) $ 0.06 $ 0.18 $ 0.30 $ 0.53