No you need to make a private sale, we're talking back alley or across a table somewhere. Getting money out of the US based exchange Mt.Gox is impossible in the range you are talking about. Currently they are cashing out everyone at $10,000/day, that isn't per person that's combined.
Or you can move your Bitcoins to another exchange (which have a much lower valuation) and which are all foreign. Then cash out there. Then repatriate your USD. Which has tax implications. So in an amount as big as $10M you're going to lose a large amount of "money."
You also have to pray that somewhere along the way your anonymous untraceable Bitcoins aren't stolen.
Or you can move your Bitcoins to another exchange (which have a much lower valuation) and which are all foreign. Then cash out there. Then repatriate your USD. Which has tax implications. So in an amount as big as $10M you're going to lose a large amount of "money."
You also have to pray that somewhere along the way your anonymous untraceable Bitcoins aren't stolen.