Your concept of debt at the federal/national level where sovereign currencies are created is in serious error. Most economies are structured around the nation's unit of measure/currency and most are created by fiat (decree) according to the fiscal policy of the currency issuer.

The debt that represents that currency creation is nothing more than an accounting function to inform of the amount of currency not yet destroyed by paying a tax obligation to the issuer. It is the current money supply, whether in the form of reserves or bonds. It is the unit of measure that is required to retire/extinguish private sector debt or to facilitate savings.

Debt in the private sector, as well as debt denominated in a currency the issuer is not able to create, is real debt and carries an expectation of payment. However, debt in the public sector that is denominated in the currency the nation creates at will does not carry such expectation beyond the assurance that it will be honored in payment of tax obligations owed to the issuer.