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Cover - USD ($)
$ in Billions
 12 Months Ended
Sep. 30, 2024
Nov. 15, 2024
Mar. 31, 2024
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2024    
Current Fiscal Year End Date --09-30    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 4.6
Documents Incorporated by Reference Portions of the registrant's Proxy Statement for the 2024 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended September 30, 2024.    
Amendment Flag false    
Entity Central Index Key 0001319161    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Class A Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   142,614,118  
Common Class B      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   375,380,313