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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, 2022
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income (loss) attributable to Warner Music Group Corp. $ 551 $ 304 $ (475)
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. 149 68 (21)
Less: Net income attributable to participating securities - Basic (7) (4) (1)
Less: Net income attributable to participating securities - Diluted (7) (4) (1)
Net income (loss) attributable to common stockholders - Basic 142 64 (22)
Net income (loss) attributable to common stockholders - Diluted $ 142 $ 64 $ (22)
Weighted average shares outstanding - Basic (in shares) 133,662,142 110,560,517 26,897,115
Weighted average shares outstanding - Diluted (in shares) 133,662,142 110,560,517 26,897,115
Basic EPS (in dollars per share) $ 1.06 $ 0.58 $ (0.82)
Diluted EPS (in dollars per share) $ 1.06 $ 0.58 $ (0.82)
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. $ 402 $ 236 $ (454)
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 402 236 (454)
Net income (loss) attributable to common stockholders - Diluted $ 402 $ 236 $ (454)
Weighted average shares outstanding - Basic (in shares) 381,046,177 402,911,743 477,624,846
Weighted average shares outstanding - Diluted (in shares) 381,046,177 402,911,743 477,624,846
Basic EPS (in dollars per share) $ 1.06 $ 0.58 $ (0.95)
Diluted EPS (in dollars per share) $ 1.06 $ 0.58 $ (0.95)