Out-of-context quote of the day:
"...although even $10 trillion isn't a huge amount of money..."
From Simon Johnson, Director of the IMF's Research Department, on "The Rise of Sovereign Wealth Funds".
So if you had $10 trillion, what would you do with it?
When it is not in physical form, it is usually in the form of a promise to pay. So, you just contact the counterparty (party who has promised) and tell them that you forgive the debt. So, it is possible to destroy $10**13.