Cover Page	6 Months Ended
	Jun. 30, 2024 shares
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2024
Document Fiscal Year Focus	2024
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Period Focus	Q2
Entity Registrant Name	MILLS MUSIC TRUST
Entity Central Index Key	0000066496
Entity Address, State or Province	NY
Entity Incorporation, State or Country Code	NY
Entity Address, Address Line One	C/O HSBC Bank USA, N.A. Corporate Trust Issuer Services
Entity Address, Address Line Two	66 Hudson Boulevard East
Entity Address, City or Town	New York
Entity Address, Postal Zip Code	10001
Current Fiscal Year End Date	--12-31
City Area Code	212
Local Phone Number	525-1349
Entity Current Reporting Status	Yes
Entity File Number	000-02123
Entity Tax Identification Number	13-6183792
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	277,712