As of February 4th, the national debt amounted to $12,346,427,470,024.01, roughly 87 percent of GDP. This is a higher percentage than it has been since 1950, in the immediate aftermath of World War II.
The Bureau of the Public Debt, however, makes a distinction between “debt held by the public,” which is $7,840,400,752,727.59 (55 percent of GDP) and “intragovernmental debt” ($4,506,026,717,296.42 — 32 percent of GDP), which is held by various branches of the federal government, principally the Social Security Trust Fund.
I think it was in this tread someone asked about this.