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Consolidated Statements of Equity (Deficit) (Unaudited) - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Class A Common Stock | Class B Common Stock | 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 | Total Warner Music Group Corp. Equity (Deficit) | Total Warner Music Group Corp. Equity (Deficit) Cumulative Effect, Period of Adoption, Adjustment | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2019 |  |  |  |  | 0 | 505,830,022 |  |  |  |  |  |  |
Beginning balance at Sep. 30, 2019 | $ (269) |  |  |  | $ 0 | $ 1 | $ 1,127 | $ (1,177) |  | $ (240) | $ (289) |  | $ 20
Beginning balance (ASC 842) at Sep. 30, 2019 |  | $ 7 |  |  |  |  |  |  | $ 7 |  |  | $ 7 |
Beginning balance (ASC 718) at Sep. 30, 2019 |  | $ 33 |  |  |  |  |  |  | $ 33 |  |  | $ 33 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (471) |  |  |  |  |  |  | (474) |  |  | (474) |  | 3
Other comprehensive income (loss), net of tax | (13) |  |  |  |  |  |  |  |  | (13) | (13) |  |
Dividends (per share) | (75) |  |  |  |  |  |  | (75) |  |  | (75) |  |
Stock-based compensation expense | 3 |  |  |  |  |  | 3 |  |  |  | 3 |  |
Distribution to noncontrolling interest holders | (6) |  |  |  |  |  |  |  |  |  |  |  | (6)
Modification of stock-based compensation plan | 769 |  |  |  |  |  | 769 |  |  |  | 769 |  |
Shares issued during period (in shares) |  |  |  |  | 77,000,000 | 77,000,000 |  |  |  |  |  |  |
Other (in shares) |  |  |  |  |  | 4,169,978 |  |  |  |  |  |  |
Other | 1 |  |  |  |  |  |  | 1 |  |  | 1 |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  | 77,000,000 | 433,000,000 |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | (21) |  |  |  | $ 0 | $ 1 | 1,899 | (1,685) |  | (253) | (38) |  | 17
Beginning balance (in shares) at Mar. 31, 2020 |  |  |  |  | 0 | 510,000,000 |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | (285) |  |  |  | $ 0 | $ 1 | 1,127 | (1,166) |  | (268) | (306) |  | 21
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (519) |  |  |  |  |  |  | (520) |  |  | (520) |  | 1
Other comprehensive income (loss), net of tax | 15 |  |  |  |  |  |  |  |  | 15 | 15 |  |
Stock-based compensation expense | 3 |  |  |  |  |  | 3 |  |  |  | 3 |  |
Distribution to noncontrolling interest holders | (5) |  |  |  |  |  |  |  |  |  |  |  | (5)
Modification of stock-based compensation plan | 769 |  |  |  |  |  | 769 |  |  |  | 769 |  |
Shares issued during period (in shares) |  |  |  |  | 77,000,000 | 77,000,000 |  |  |  |  |  |  |
Other | 1 |  |  |  |  |  |  | 1 |  |  | 1 |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  | 77,000,000 | 433,000,000 |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | (21) |  |  |  | $ 0 | $ 1 | 1,899 | (1,685) |  | (253) | (38) |  | 17
Beginning balance (in shares) at Sep. 30, 2020 |  |  | 88,578,361 | 421,450,000 | 88,578,361 | 421,450,000 |  |  |  |  |  |  |
Beginning balance at Sep. 30, 2020 | (45) |  |  |  | $ 0 | $ 1 | 1,907 | (1,749) |  | (222) | (63) |  | 18
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 277 |  |  |  |  |  |  | 276 |  |  | 276 |  | 1
Other comprehensive income (loss), net of tax | 28 |  |  |  |  |  |  |  |  | 28 | 28 |  |
Dividends (per share) | (187) |  |  |  |  |  |  | (187) |  |  | (187) |  |
Stock-based compensation expense | 27 |  |  |  |  |  | 27 |  |  |  | 27 |  |
Distribution to noncontrolling interest holders | (6) |  |  |  |  |  |  |  |  |  |  |  | (6)
Exchange of Class B shares for Class A shares (in shares) |  |  |  |  | 19,234,103 | 19,234,106 |  |  |  |  |  |  |
Shares issued during period (in shares) |  |  |  |  | 4,321,259 |  |  |  |  |  |  |  |
Conversion of Class B shares (in shares) |  |  |  |  | 4,754,626 | 4,754,626 |  |  |  |  |  |  |
Shares issued under Omnibus Incentive Plan (in shares) |  |  |  |  | 33,205 |  |  |  |  |  |  |  |
Other | 1 |  |  |  |  |  |  |  |  |  |  |  | 1
Ending balance (in shares) at Jun. 30, 2021 |  |  | 116,921,554 | 397,461,268 | 116,921,554 | 397,461,268 |  |  |  |  |  |  |
Ending balance at Jun. 30, 2021 | 95 |  |  |  | $ 0 | $ 1 | 1,934 | (1,660) |  | (194) | 81 |  | 14
Beginning balance (in shares) at Mar. 31, 2021 |  |  |  |  | 116,921,411 | 397,461,268 |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2021 | 73 |  |  |  | $ 0 | $ 1 | 1,924 | (1,659) |  | (209) | 57 |  | 16
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 61 |  |  |  |  |  |  | 61 |  |  | 61 |  | 0
Other comprehensive income (loss), net of tax | 15 |  |  |  |  |  |  |  |  | 15 | 15 |  |
Dividends (per share) | (62) |  |  |  |  |  |  | (62) |  |  | (62) |  |
Stock-based compensation expense | 10 |  |  |  |  |  | 10 |  |  |  | 10 |  |
Distribution to noncontrolling interest holders | (3) |  |  |  |  |  |  |  |  |  |  |  | (3)
Shares issued under Omnibus Incentive Plan (in shares) |  |  |  |  | 143 |  |  |  |  |  |  |  |
Other | (1) |  |  |  |  |  |  |  |  |  |  |  | (1)
Ending balance (in shares) at Jun. 30, 2021 |  |  | 116,921,554 | 397,461,268 | 116,921,554 | 397,461,268 |  |  |  |  |  |  |
Ending balance at Jun. 30, 2021 | $ 95 |  |  |  | $ 0 | $ 1 | $ 1,934 | $ (1,660) |  | $ (194) | $ 81 |  | $ 14

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