XML 27 R1.htm IDEA: XBRL DOCUMENT v3.25.2
Cover - shares
 9 Months Ended
Jun. 30, 2025
Aug. 04, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-32502  
Entity Registrant Name Warner Music Group Corp.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 13-4271875  
Entity Address, Address Line One 1633 Broadway  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10019  
City Area Code (212)  
Local Phone Number 275-2000  
Title of 12(b) Security Class A Common Stock, $0.001 par value per share  
Trading Symbol WMG  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001319161  
Current Fiscal Year End Date --09-30  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   145,886,566
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   375,380,313