While this sounds like a lot of money (and it is!), keep in mind that GM earned around $175 Billion in revenue last year. So $2 Billion is what GM makes every two days. 

Once you get past the massive investment, it makes sense for what they're actually spending it on: their future. 

The new Technology & Design Center in Michigan houses the engineers and creatives who will dream-up the vehicles of the future, as well as the 3D design centers, conference rooms, inspiration areas, and all the bells-and-whistles a modern technology center could provide. 

The price is almost meaningless if it results in a competitive advantage for GM and increase in market share. To NOT invest in the company's future could be far more costly.