I am preparing a proof of concept for a user account dashboard to show positive and negative values within a graph of some sort.
it seems that you want people to be aware of the range of divergence.
A problem with pie charts in general is that users have a difficult time comparing values as part of circular shape. They also don't display divergence within a set.
Visualizing a range
Try using a Span Bar Chart if you want to show the range of both values.
If you have more than one pair of these values, you can stack them.