What is total credit market debt?

Came across this blog read: http://alephblog.com/2008/11/12/what-is-a-depression/#comments So my question is, what is included in total credit market debt?

On CNBC yesterday a guy estimated total public + private debt at $51T.

Yeah I guess that’s what it means. Anyone know a source for the equivalent debt data for major foreign economies such as Japan, Germany, etc. ? Would like to create a similar comparison