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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, 2021
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) attributable to Warner Music Group Corp. $ 304 $ (475) $ 256
Common Class A      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) attributable to Warner Music Group Corp. 68 (21) 0
Less: Net income attributable to participating securities - Basic (4) (1) 0
Less: Net income attributable to participating securities - Diluted (4) (1) 0
Net income (loss) attributable to common stockholders - Basic 64 (22) 0
Net income (loss) attributable to common stockholders - Diluted $ 64 $ (22) $ 0
Weighted average shares outstanding - Basic (in shares) 110,560,517 26,897,115 0
Weighted average shares outstanding - Diluted (in shares) 110,560,517 26,897,115 0
Basic EPS (in dollars per share) $ 0.58 $ (0.82) $ 0
Diluted EPS (in dollars per share) $ 0.58 $ (0.82) $ 0
Common Class B      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) attributable to Warner Music Group Corp. $ 236 $ (454) $ 256
Less: Net income attributable to participating securities - Basic 0 0 0
Less: Net income attributable to participating securities - Diluted 0 0 0
Net income (loss) attributable to common stockholders - Basic 236 (454) 256
Net income (loss) attributable to common stockholders - Diluted $ 236 $ (454) $ 256
Weighted average shares outstanding - Basic (in shares) 402,911,743 477,624,846 501,991,944
Weighted average shares outstanding - Diluted (in shares) 402,911,743 477,624,846 501,991,944
Basic EPS (in dollars per share) $ 0.58 $ (0.95) $ 0.51
Diluted EPS (in dollars per share) $ 0.58 $ (0.95) $ 0.51