Missing Working Capital data

I am playing around with a Debt to Working Capital formula and noticed that several well know companies do not have Current Asset/Liability (Working Capital data) in P123. it just returns N/A. Some (not all) companies are Ford Motor, General Electric, Textron, Marriott Vacations, DreamWorks and many home builders (DR Horton, toll Brothers, Beazer, Meritage). I was able to get a rough cut elsewhere on Ford but that did not look right.
This is not a show stopper for me but does anyone know why well know, non-Financial companies like these don’t have Current data in P123? I have not looked at their 10Qs yet.
thanks.
David