The waterfall chart is often used by strategy consultants at companies like McKinsey to show the sources of change behind two values. It can be tricky to create in PowerPoint. This slide is a template for a waterfall chart in PowerPoint.
It is a manual version though. I have set up everything as good as I could, with different colours for totals, ups, and downs. Still, you need to do some manual calculations to make it fit to your specific situation. Also, data labels are added manually.
An automated version of the waterfall chart is still work in progress.
You can read about the approach to making waterfall charts in PowerPoint (or Excel) in this earlier blog post. It also possible to use Excel itself to create waterfalls (see the Microsoft support site). But, this does not work on a Mac, and the formatting is "very Excel" is unlikely to fit your corporate template.
This layout is available as either a PowerPoint or Keynote template.