Is there a website where I could plug in the name of a corporation and find a listing of the amount of money (if any) they donated to charity and what charities? Or a relatively easy way to find this info?
I can’t think of a site where corporate charitable donations are listed but if you go to the company’s website you will probably find informations on this - after all, it’s not something they want to keep secre 
Try looking under “Corporate Social Responsibility” or something like that.
The red cross has a listing, not the best resource though…