You know I did some research on this topic and I have found Toyota Motors market value is $130 billion dollars and a global rank of 26 were as GM is ranked 4 with a total valuation of $195 billion can't find by division which would make more sense.
You see Toyota does a lot of other stuff to, I read somewhere that they own one of the largest plastics refinment companies in Asia based in Kyota, which obvisouly they use on their cars where as GM does it the (new) American way and is contracting out more and more production (probably they're downfall), but Toyota has to be careful because a lot of companies have diversified to much and that can hurt themselves because if something goes wrong in one market the others have to make up for it and it all trickles down.
I would never see it happen though GM still has VERY VERY deep pockets its just you don't hear about it - look at the stock in the 90s it was above 100 for 5 straight years, that's some big cahunas your putting away there for the long term.