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Earnings per Share - Schedule of Earnings per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Warner Music Group Corp. $ 430 $ 551 $ 304
Class A Common Stock      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Warner Music Group Corp. 119 149 68
Less: Net income attributable to participating securities - Basic (6) (7) (4)
Less: Net income attributable to participating securities - Diluted (6) (7) (4)
Net income attributable to common stockholders - Basic 113 142 64
Net income attributable to common stockholders - Diluted $ 113 $ 142 $ 64
Weighted average shares outstanding - Basic (in shares) 138,070,000 133,662,000 110,561,000
Weighted average shares outstanding - Diluted (in shares) 138,070,000 133,662,000 110,561,000
Basic EPS (in dollars per share) $ 0.82 $ 1.06 $ 0.58
Diluted EPS (in dollars per share) $ 0.82 $ 1.06 $ 0.58
Common Class B      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Warner Music Group Corp. $ 311 $ 402 $ 236
Less: Net income attributable to participating securities - Basic 0 0 0
Less: Net income attributable to participating securities - Diluted 0 0 0
Net income attributable to common stockholders - Basic 311 402 236
Net income attributable to common stockholders - Diluted $ 311 $ 402 $ 236
Weighted average shares outstanding - Basic (in shares) 377,650,000 381,046,000 402,912,000
Weighted average shares outstanding - Diluted (in shares) 377,650,000 381,046,000 402,912,000
Basic EPS (in dollars per share) $ 0.82 $ 1.06 $ 0.58
Diluted EPS (in dollars per share) $ 0.82 $ 1.06 $ 0.58