It seems like pricing it however they liked could be fraud to investors. Especially if it can be shown they did so to make one part of their company look more attractive.
I really hope they aren't doing this but have some justifiable metric for determining the price of their intercompany transactions.
Intel said that they are capping how much the foundry can charge internally for wafers based upon competitive pricing. There's a lot of leeway in that statement though. I have my doubts that Intel foundry is charging Intel design what they would if they were truly independent.