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Consolidated Statements of Deficit (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ (45) $ (269)  
Net income 99 122  
Other comprehensive income (loss), net of tax 37 10  
Dividends ($0.12 per Class A and B share) (62) (38)  
Stock-based compensation expense 6    
Distribution to noncontrolling interest holders (2) (1)  
Exchange of Class B shares for Class A shares 0    
Other   0  
Ending balance $ 33 (169) $ (269)
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201602Member
ASC 842 | Cumulative Effect, Period of Adoption, Adjustment      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance   $ 7  
Ending balance     $ 7
Class A Common Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 88,578,361    
Ending balance (in shares) 111,167,356    
Class B Common Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 421,450,000    
Exchange of LLC Units for Class A shares (in shares) 18,265,813    
Ending balance (in shares) 403,184,814    
Common Stock | Class A Common Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 88,578,361 0  
Beginning balance $ 0 $ 0  
Exchange of LLC Units for Class A shares (in shares) 18,265,183    
Shares issued under the Plan (in shares) 4,321,259    
Shares issued under Omnibus Incentive Plan (in shares) 2,553    
Ending balance (in shares) 111,167,356 0 0
Ending balance $ 0 $ 0 $ 0
Common Stock | Class B Common Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (in shares) 421,450,000 505,830,022  
Beginning balance $ 1 $ 1  
Exchange of LLC Units for Class A shares (in shares) 18,265,186    
Other (in shares)   4,169,978  
Ending balance (in shares) 403,184,814 510,000,000 505,830,022
Ending balance $ 1 $ 1 $ 1
Additional Paid-in Capital      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 1,907 1,127  
Stock-based compensation expense 6    
Ending balance 1,913 1,127 1,127
Accumulated Deficit      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (1,749) (1,177)  
Net income 98 120  
Dividends ($0.12 per Class A and B share) (62) (38)  
Ending balance (1,713) (1,088) (1,177)
Accumulated Deficit | ASC 842 | Cumulative Effect, Period of Adoption, Adjustment      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance   7  
Ending balance     7
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (222) (240)  
Other comprehensive income (loss), net of tax 37 10  
Ending balance (185) (230) (240)
Total Warner Music Group Corp. Equity (Deficit)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (63) (289)  
Net income 98 120  
Other comprehensive income (loss), net of tax 37 10  
Dividends ($0.12 per Class A and B share) (62) (38)  
Stock-based compensation expense 6    
Ending balance 16 (190) (289)
Total Warner Music Group Corp. Equity (Deficit) | ASC 842 | Cumulative Effect, Period of Adoption, Adjustment      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance   7  
Ending balance     7
Non-controlling Interest      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 18 20  
Net income 1 2  
Distribution to noncontrolling interest holders (2) (1)  
Ending balance $ 17 $ 21 $ 20