100 dollars per natural day on international flights irrespective of trip duration. The company covers all other costs not associated with meals (taxi, rental car, hotel, calls, laundry, internet etc etc). In domestic flights is 50 dollars and company covers all expenses (including meals).
The only policy we are required to follow is "use common sense on crew expenses" i.e. no mercedes S63 AMG for a rental car and forget the Mandarin Oriental as the standard hotel.