Didn’t he retract from the Gates foundation last year. His children will be in charge of it to “donate”. I don’t know the specific mechanics but seems like it’s a good way to simply give it to your kids. They all run types of charities.
https://www.inc.com/jason-aten/with-4-words-warren-buffett-e...
Not to rain on anyone's parade but it is important to note that philanthropic trusts are an excellent way to avoid taxes.