It depends on how you measure the value of these companies. If you go by market cap then yes Tesla is worth more than all of them combined. The reason for this

It depends on how you measure the value of these companies. If you go by market cap then yes Tesla is worth more than all of them combined. The reason for this is that all those other companies you mention have enormous debt, whereas Tesla's debt is fairly negligible. Tesla has 10 billion dollars in debt compared to GM which has over 100 billion dollars in debt or Ford which has over 150 billion dollars in debt.