The St. Louis FED did a story on this last year [1] that basically said there are two main reasons why you would stockpile cash if you're a regular company (non-finance, non-utility): precautionary motive and repatriation taxes. With respect to the first it comes down to uncertainty and credit constraints. Since the credit issue is basically zero for thees companies then it likely comes down to uncertainty in the mar…
In your case, that burn rate would go down to $5 billion in a year or two. Apple justifies the burn rate because it's making a killing, when that stops...
Lower the corp tax and they'll repatriate the day after.