<http://schema.org/description>
"There are plenty of ways to tally up the US government's federal debt. The total Treasury debt outstanding was about $16.74 trillion at the end of July. But the US owes about $4.84 trillion to itself, mostly in the form of debt that is issued to entities such as the Social Security trust fund. So..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://qz.com/111454/the-us-government-has-about-70-trillion-in-off-balance-sheet-liabilities/>