Kannan,
I do not know any such IDOCs. But what is the business process which brings you to this requirement. It depends on the requirement if you need to send data in a periodic manner, as an Audit trail or real time.
On top of my head, you can always created custom IDOC & get it triggered in associated userexit/BADI. Also, you can create a batch job to trigger IDOCs to collect the password change information.
Rgds,
Ravi