Which placement of Rahu in a horoscope makes a native a billionaire?

Rahu has the potential of giving a lot of wealth, but it is a shadow planet and cannot work alone.

So, we need to know

In D1 Chart (Birth Chart)
1. The house in which it is present
2. How is the Lord of the House placed in which Rahu is present
3. Whether it is getting connected to House 2, 7, 10, 11
In D9 Chart (Navamsha) – Divisional Chart
1. Placement of Rahu
In D10 chart(Dashamsa) – Divisional Chart
1. Linkage of Rahu to 3rd, 6th, 10th and 11th House

Taking all this into account, only we can say anything

Also, note there is a difference between becoming a Billionaire and staying a Billionaire

For the latter, a supporting Jupiter and strong Saturn are essential

Hope this helps

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God Bless!