NEW YORK (AP) — Airbnb plans to dedicate $500 million to its philanthropic arm over the next five years to increase temporary housing support for medical travelers and disaster survivors.

The short-term rental platform will fund the expansion by donating 10 cents from every booking and make up any shortfall, according to Airbnb CEO Brian Chesky. Airbnb.org, the independent nonprofit whose operating costs are already covered by the company, aims to scale up to eventually provide 1 million nights of free housing each year.

The pledge, announced Wednesday, arrives at an uncertain time for corporate philanthropy overall. Most companies reduced their giving over the past five years, according to a recent survey by Chief Executives for Corporate Purpose.…