From the link it seems that all major economic powers have a large "external debt". Then who are the creditors? If every country paid their debt, where would the money end up?
And I see from the article that "... while a country may have a relatively large external debt (either in absolute or per capita terms) it could actually be a "net international creditor" .
Wouldn't it be better to focus on this "balance of debts vs. assets?"