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Consolidated Statements of Equity (Deficit) - USD ($)
$ in Millions
Total
Revision of Prior Period, Accounting Standards Update, Adjustment
Cumulative Effect, Period of Adoption, Adjustment
Common Class A
Common Class B
Total Warner Music Group Corp. Equity
Total Warner Music Group Corp. Equity
Revision of Prior Period, Accounting Standards Update, Adjustment
Total Warner Music Group Corp. Equity
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Common Class A
Common Stock
Common Class B
Additional Paid-in Capital
Accumulated Deficit
Accumulated Deficit
Revision of Prior Period, Accounting Standards Update, Adjustment
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Noncontrolling Interest
Noncontrolling Interest
Revision of Prior Period, Accounting Standards Update, Adjustment
Beginning balance (in shares) at Sep. 30, 2018                 0 501,991,944              
Beginning balance at Sep. 30, 2018 $ (320) $ 150       $ (334) $ 139   $ 0 $ 1 $ 1,127 $ (1,272) $ 139   $ (190) $ 14 $ 11
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net income 258         256           256       2  
Other comprehensive loss, net of tax (50)         (50)                 (50)    
Dividends (300)         (300)           (300)          
Distribution to noncontrolling interest holders (3)                             (3)  
Other (in shares)                   (3,838,078)              
Other (4)                             (4)  
Ending balance (in shares) at Sep. 30, 2019                 0 505,830,022              
Ending balance at Sep. 30, 2019 (269)         (289)     $ 0 $ 1 1,127 (1,177)     (240) 20  
Ending balance (Accounting Standards Update 2016-02) at Sep. 30, 2019     $ 7         $ 7           $ 7      
Ending balance (Accounting Standards Update 2016-09) at Sep. 30, 2019     $ 33         $ 33           $ 33      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net income (470)         (475)           (475)       5  
Other comprehensive loss, net of tax 18         18                 18    
Dividends (137)         (137)           (137)          
Stock-based compensation expense 11         11         11            
Distribution to noncontrolling interest holders (7)                             (7)  
Modification of stock-based compensation plan 769         769         769            
Stock issued during period (in shares)                 88,550,000 88,550,000              
Shares issued under Omnibus Incentive Plan (in shares)                 28,361                
Other (in shares)                   (4,169,978)              
Ending balance (in shares) at Sep. 30, 2020       88,578,361 421,450,000       88,578,361 421,450,000              
Ending balance at Sep. 30, 2020 (45)         (63)     $ 0 $ 1 1,907 (1,749)     (222) 18  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Net income 307         304           304       3  
Other comprehensive loss, net of tax 20         20                 20    
Dividends (265)         (265)           (265)          
Stock-based compensation expense 35         35         35            
Distribution to noncontrolling interest holders (7)                             (7)  
Exchange of Class B shares for Class A shares (in shares)                 19,234,103 19,234,106              
Stock issued during period (in shares)                 4,321,259                
Conversion of Class B shares         10,244,898       10,244,898 10,244,898              
Shares issued under Omnibus Incentive Plan (in shares)                 36,206                
Other 1                             1  
Ending balance (in shares) at Sep. 30, 2021       122,414,827 391,970,996       122,414,827 391,970,996              
Ending balance at Sep. 30, 2021 $ 46         $ 31     $ 0 $ 1 $ 1,942 $ (1,710)     $ (202) $ 15