It's going to take a whole lot more than a few billion. I read somewere that the aircraft carrier currently under construction is running $15 billion alone.
Going to all nuke generated steamer carriers was a stupid idea to start with. We needed at least three conventional steamers. Faster crew training in the event of mass casualties by about two thirds, faster to build by half, and cheaper to build. If our politicians had allowed drilling and exploration for our own oil the fuel would have been cheap as well.