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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) 48             46     46   2
Other comprehensive income (loss), net of tax (28)                 (28) (28)    
Dividends (per share) (75)             (75)     (75)    
Distribution to noncontrolling interest holders (1)                       (1)
Other (in shares)           4,169,978              
Other 0                        
Ending balance (in shares) at Mar. 31, 2020         0 510,000,000              
Ending balance at Mar. 31, 2020 $ (285)       $ 0 $ 1 1,127 (1,166)   (268) (306)   21
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201409Member                        
Beginning balance (in shares) at Dec. 31, 2019         0 510,000,000              
Beginning balance at Dec. 31, 2019 $ (169)       $ 0 $ 1 1,127 (1,088)   (230) (190)   21
Beginning balance (ASC 718) at Dec. 31, 2019   $ 33             $ 33     $ 33  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net income (loss) (74)             (74)     (74)   0
Other comprehensive income (loss), net of tax (38)                 (38) (38)    
Dividends (per share) (37)             (37)     (37)    
Ending balance (in shares) at Mar. 31, 2020         0 510,000,000              
Ending balance at Mar. 31, 2020 (285)       $ 0 $ 1 1,127 (1,166)   (268) (306)   21
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) 216             215     215   1
Other comprehensive income (loss), net of tax 13                 13 13    
Dividends (per share) (125)             (125)     (125)    
Stock-based compensation expense 17           17       17    
Distribution to noncontrolling interest holders (3)                       (3)
Exchange of LLC units for class A shares (in shares)         19,234,103 19,234,106              
Shares issued under the Plan (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)         33,062                
Ending balance (in shares) at Mar. 31, 2021     116,921,411 397,461,268 116,921,411 397,461,268              
Ending balance at Mar. 31, 2021 73       $ 0 $ 1 1,924 (1,659)   (209) 57   16
Beginning balance (in shares) at Dec. 31, 2020         111,167,356 403,184,814              
Beginning balance at Dec. 31, 2020 33       $ 0 $ 1 1,913 (1,713)   (185) 16   17
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net income (loss) 117             117     117   0
Other comprehensive income (loss), net of tax (24)                 (24) (24)    
Dividends (per share) (63)             (63)     (63)    
Stock-based compensation expense 11           11       11    
Distribution to noncontrolling interest holders (1)                       (1)
Exchange of LLC units for class A shares (in shares)         968,920 968,920              
Exchange of Class B shares for Class A shares             0       0    
Conversion of Class B shares (in shares)         4,754,626 4,754,626              
Shares issued under Omnibus Incentive Plan (in shares)         30,509                
Ending balance (in shares) at Mar. 31, 2021     116,921,411 397,461,268 116,921,411 397,461,268              
Ending balance at Mar. 31, 2021 $ 73       $ 0 $ 1 $ 1,924 $ (1,659)   $ (209) $ 57   $ 16