What happens to the price of bitcoin when you try to sell $1B worth? The first few buyers might be paying the asking price, but presumably the order book has o

What happens to the price of bitcoin when you try to sell $1B worth? The first few buyers might be paying the asking price, but presumably the order book has offers to buy at considerably less than today’s $/BTC? Are there any markets out there that quote the price of stocks in terms of the total (average? median?) value of currently placed orders?