If you go to Glassdoor.com, search for Schwab and then look at Salaries you will see salaries submitted by employees. There are a lot of managing directors with total compensation of well, well north of $200k. So a 2000 headcount reduction hits $500 million easily.
This whole layoff looks like the work of Boston Consulting coming in with a template that did not consider anything but getting to a total dollar cut. It's easy to cut people 2 steps removed from the hands on business processes and expand the span of control. Not very thoughtful and very profitable for consulting firms.