I'm not a CFO, but have worked with and for a few of them over the years. I'm in a line role now, and have been for most of my 25 years with megacorp, but I did report to the CFO for three years while in a staff role. (megacorp was a $700million company in 20 countries when I signed up, about $25billion in 70 countries now). As background, in my role now, I lead a major geographic division with revenues of several billion USD, have a Divisional CFO and COO along with 10 or so country managers reporting to me.
I think the best CFO I've ever worked for or with was very much as bbbamI described. From my experience, you will need to develop those attributes, as well as developing skills and experience with the following, if you want to reach the CFO level in a major public multinational:
1) SOX
2) complex tax strategies and transfer pricing
3) complex treasury strategies
4) investor relations and dealing with stock analysts and fund managers
5) legal, to an extent
6) M&A, integration
If you are still in a private company, I would suggest looking for the highest role your experience will allow in a public firm so that you can get exposure to some of the experiences I mentioned above, that you are not likely to get in a private co. My guess is that it will likely take a couple or three, maybe more, career moves to get the experience you need.
Good luck to you.
R