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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator        
Net income (loss) attributable to Warner Music Group Corp. $ 61 $ (520) $ 276 $ (474)
Class A Common Stock        
Numerator        
Net income (loss) attributable to Warner Music Group Corp. 15 (21) 61 (7)
Less: Net income attributable to participating securities (1) 0 (4) 0
Net income (loss) attributable to common stockholders $ 14 $ (21) $ 57 $ (7)
Denominator        
Weighted average shares outstanding, basic (in shares) 116,890,959 20,307,692 108,245,599 6,769,231
Weighted average shares outstanding, diluted (in shares) 116,890,959 20,307,692 108,245,599 6,769,231
Basic (in dollars per share) $ 0.12 $ (1.03) $ 0.53 $ (1.09)
Diluted (in dollars per share) $ 0.12 $ (1.03) $ 0.53 $ (1.09)
Class B Common Stock        
Numerator        
Net income (loss) attributable to Warner Music Group Corp. $ 46 $ (499) $ 215 $ (467)
Less: Net income attributable to participating securities 0 0 0 0
Net income (loss) attributable to common stockholders $ 46 $ (499) $ 215 $ (467)
Denominator        
Weighted average shares outstanding, basic (in shares) 397,461,268 483,796,267 404,933,311 495,926,718
Weighted average shares outstanding, diluted (in shares) 397,461,268 483,796,267 404,933,311 495,926,718
Basic (in dollars per share) $ 0.12 $ (1.03) $ 0.53 $ (0.94)
Diluted (in dollars per share) $ 0.12 $ (1.03) $ 0.53 $ (0.94)