At present Alitalia has debts amounting to 2.3 billion euros. This is the sum given by the extraordinary commissioner of the national airline, Augusto Fantozzi, who spoke to Fabio Fazio on the TV programme "Che tempo che fa". He also told the viewers he did recognize the risk that Italian taxpayers may have to pay the part of this debt if the ongoing negotiations would not succeed.
The full text from La Stampa can be read
here (in Italian).