There's only one section of our economy that has that kind of money: the military budget. The U.S. now spends more on its military than all other nations combined. A sane transit to a post-automobile America will require a massive shift from military to infrastructure spending. That shift would be supported by our bankers in China and Europe (that is, they would continue to finance our debt) because it's in their interests that we regain economic viability. What's not in their interests is that we remain a military superpower.
This is in a column for the Austin Chronicle: $4 a Gallon. This article is the best single, concise explanation of America's position in the world today.