Then you’re down to a couple hundred mil at most, after taxes, the divorce split, and lawyers. If it would be worth that much to be rid of them, then why not do it now, when it would be so much cheaper?
My wife and I have had the “large lottery win” discussion a few times. Yeah, with a billion we’d make a few lifestyle changes. For starters we’d move to a state with no state income tax (and be very vocal about it to our current state). The money saved would pay for frequent trips back to see the kids and grandkids. There would be more travel - much more. Then there would be a trust fund so that our descendants would not be able to live the life of spoiled a*****e idle rich, but would at least have an education and some help when they need it.
A billion dollars would allow us to do everything we wanted and never touch the principal. I don’t think we’d make some grand gesture large donations up front; we’d be able to donate tens of millions every year and not even feel it.