You had the same idea I did — but, the answer would be:
Toyota, General Motors, and Volkswagen.
Ford is #5, and Fiat #9.
http://omgtoptens.com/misc/weapons/top-10-largest-auto-companies-world-2012/
What, Gubmint Motors?
The UAW is striking against itself?
The Big 3 used to refer to the three top US makes, but you make a good point. Sad, the US auto industry was unbeatable at one time. Now, it’s doing good just to get half of its home market.