The Detroit-based Skillman Foundation is contributing $3.5 million to help offset health care cuts to city retirees.
Mediators in Detroit's bankruptcy made the announcement Tuesday.
The city no longer provides health insurance for some city retirees and has reduced benefits for others as part of its bankruptcy restructuring. The Skillman donation would help preserve health care benefits for families with children and grandchildren.
It isn't part of efforts by other foundations and private citizens to protect city-owned artwork from sale by funding municipal employee pensions. So far, foundations have committed about $370 million to that plan.
The Michigan Senate on Tuesday approved legislation to spend $195 million to help shore up Detroit's pension funds.
The Detroit Institute of Arts has said it will raise an additional $100 million.