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Consolidated Statements of Equity - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Class A Common Stock | Class B Common Stock | Total Warner Music Group Corp. Equity (Deficit) | Total Warner Music Group Corp. Equity (Deficit) Cumulative Effect, Period of Adoption, Adjustment | Common Stock Class A Common Stock | Common Stock Class B Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2022 |  |  |  |  |  |  | 137,199,000 | 377,650,000 |  |  |  |  |
Beginning balance at Sep. 30, 2022 | $ 168 |  |  |  | $ 152 |  | $ 0 | $ 1 | $ 1,975 | $ (1,477) |  | $ (347) | $ 16
Beginning balance (Accounting Standards Update 2016-02) at Sep. 30, 2022 |  | $ 0 |  |  |  | $ 0 |  |  |  |  | $ 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 439 |  |  |  | 430 |  |  |  |  | 430 |  |  | 9
Other comprehensive (loss) income, net of tax | 25 |  |  |  | 25 |  |  |  |  |  |  | 25 |
Dividends | (340) |  |  |  | (340) |  |  |  |  | (340) |  |  |
Stock-based compensation expense | 39 |  |  |  | 39 |  |  |  | 39 |  |  |  |
Distribution to noncontrolling interest holders | (12) |  |  |  |  |  |  |  |  |  |  |  | (12)
Conversion of Class B shares to Class A shares (in shares) |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Acquisition of noncontrolling interests | 112 |  |  |  |  |  |  |  |  |  |  |  | 112
Shares issued under the plan (in shares) |  |  |  |  |  |  | 869,000 |  |  |  |  |  |
Shares issued under Omnibus incentive plan (in shares) |  |  | 276,516 |  |  |  | 277,000 |  |  |  |  |  |
Other | (1) |  |  |  | 1 |  |  |  | 1 |  |  |  | (2)
Ending balance (in shares) at Sep. 30, 2023 |  |  |  |  |  |  | 138,345,000 | 377,650,000 |  |  |  |  |
Ending balance at Sep. 30, 2023 | 430 |  |  |  | 307 |  | $ 0 | $ 1 | 2,015 | (1,387) |  | (322) | 123
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 478 |  |  |  | 435 |  |  |  |  | 435 |  |  | 43
Other comprehensive (loss) income, net of tax | 75 |  |  |  | 75 |  |  |  |  |  |  | 75 |
Dividends | (361) |  |  |  | (361) |  |  |  |  | (361) |  |  |
Stock-based compensation expense | 67 |  |  |  | 67 |  |  |  | 67 |  |  |  |
Distribution to noncontrolling interest holders | (8) |  |  |  |  |  |  |  |  |  |  |  | (8)
Acquisition of noncontrolling interests | (1) |  |  |  |  |  |  |  |  |  |  |  | (1)
Shares issued under the plan (in shares) |  |  |  |  |  |  | 1,738,016 | 2,270,136 |  |  |  |  |
Exchange of Class B shares for Class A shares (in shares) |  |  |  |  |  |  | 2,270,000 | 2,270,000 |  |  |  |  |
Shares issued under Omnibus incentive plan (in shares) |  |  | 206,298 |  |  |  | 206,000 |  |  |  |  |  |
Shares issued under Omnibus Incentive Plan | (5) |  |  |  | (5) |  |  |  | (5) |  |  |  |
Other | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0
Ending balance (in shares) at Sep. 30, 2024 |  |  | 142,559,000 | 375,380,000 |  |  | 142,559,000 | 375,380,000 |  |  |  |  |
Ending balance at Sep. 30, 2024 | 675 |  |  |  | 518 |  | $ 0 | $ 1 | 2,077 | (1,313) |  | (247) | 157
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 370 |  |  |  | 365 |  |  |  |  | 365 |  |  | 5
Other comprehensive (loss) income, net of tax | 58 |  |  |  | 58 |  |  |  |  |  |  | 58 |
Dividends | (383) |  |  |  | (383) |  |  |  |  | (383) |  |  |
Stock-based compensation expense | 61 |  |  |  | 61 |  |  |  | 61 |  |  |  |
Distribution to noncontrolling interest holders | (15) |  |  |  |  |  |  |  |  |  |  |  | (15)
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  |  |  |  |  |  | 800,000 |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (20) |  |  |  | (20) |  |  |  | (20) |  |  |  |
Acquisition of noncontrolling interests | 74 |  |  |  |  |  |  |  |  |  |  |  | 74
Shares issued under the plan (in shares) |  |  |  |  |  |  | 2,607,027 |  |  |  |  |  |
Shares issued under Omnibus incentive plan (in shares) |  |  | 799,748 |  |  |  |  |  |  |  |  |  |
Common shares repurchased and retired (in shares) |  |  |  |  |  |  | (477,000) |  |  |  |  |  |
Common shares repurchased and retired | (16) |  |  |  | (16) |  |  |  | (16) |  |  |  |
Redemption of noncontrolling interests (in shares) |  |  |  |  |  |  | 1,417,000 |  |  |  |  |  |
Redemption of noncontrolling interests | (47) |  |  |  | 64 |  |  |  | 64 |  |  |  | (111)
Ending balance (in shares) at Sep. 30, 2025 |  |  | 146,906,000 | 375,380,000 |  |  | 146,906,000 | 375,380,000 |  |  |  |  |
Ending balance at Sep. 30, 2025 | $ 757 |  |  |  | $ 647 |  | $ 0 | $ 1 | $ 2,166 | $ (1,331) |  | $ (189) | $ 110

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