A billion? Wow that will get them running faster than anything. I think the highest movie budget was just over 100 million.
I really don't think they would even ask a first timer about budget, after all a script can be re-written to fit different budgets. I think you are better off sticking with ranges if they ask about budget.
If you have few locations, few characters, no stunts, no explosions, and no special effects, then your movie can be done on a very-low to low budget. If you have a mid of these it can be done on a low to mid budget, if you are exploding everywhere, fight scenes, big stunts, massive ammounts of actors and such, then you are going to be in a high budget.
I would suggest keeping it clean and candid, straight forward, prepare for extra questions but try to keep it focused. Recite a 3-5 minute synopsis of your story, have it linear and concise. Have other materials such as a treatment, character synopses, if they ask for them but don't push them, if they want them they will ask.
Be prepared to talk about your characters, make sure you recite their characteristics.
Know what audience you are wanting to market it to, the appeal factor.
And make sure you put your best selling points forward, and leave the extra fluff behind. It sounds silly but practice before you pitch. Practice in front of family members, friends, anything that gets it drilled in there and helps you to portray it natural is suggested.
Good luck!! I hope it goes well and it I hope this helps. Use what you can, tailor it to suit you best.
Sara