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Cover
Feb. 01, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 01, 2021
Entity Registrant Name Warner Music Group Corp.
Entity Central Index Key 0001319161
Trading Symbol WMG
Security Exchange Name NASDAQ
Title of 12(b) Security Class A Common Stock
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Incorporation, State or Country Code DE
Entity File Number 001-32502
Entity Tax Identification Number 13-4271875
Entity Address, Postal Zip Code 10019
Entity Address, State or Province NY
Entity Address, City or Town New York
Entity Address, Address Line One 1633 Broadway
Local Phone Number 275-2000
City Area Code (212)
Entity Emerging Growth Company false