I don't understand why Apple would be responsible for paying that money. Ireland made a deal with them so that they wouldn't have to pay that money, and then the EU told them to anyway. It's not Apple's fault that Daddy EU decided that Ireland's deal was wrong. If anything, they should just have to pay normal taxes from this point forward.
Furthermore, by current metrics apple has somewhere between 15 and 20 billion in cash and $50 billion in debt. So, I think it's safe to say that if they legitimately had *extra cash* they would pay their debt, so they probably need that much money to operate properly.