The successor eclipses that, but not by much (percentage-wise). According to https://en.wikipedia.org/wiki/Gerald_R._Ford-class_aircraft_..., the Gerald Ford costs $10.4 billion.

The linked PDF, however, states (http://www.gao.gov/assets/670/668986.pdf#page95):

"The Navy awarded a construction contract for CVN 78 in September 2008 when 5 of the ship's 13 critical technologies were mature and with only 65 percent of the ship's three-dimensional model complete. Since then, the lead ship's procurement costs have grown by almost 23 percent from $10.5 billion to $12.9 billion—the limit of the ship's current legislated cost cap—with four technologies still immature. The ship's critical technologies continue to experience developmental challenges, which poses risks to the ship's testing and delivery schedule. CVN 79 is also subject to a cost cap of $11.5 billion and its program office has adopted a new two-phased approach to construction to manage its costs. While this strategy may enable the Navy to meet the cost cap, it will also transfer some ship construction to the phase following delivery."

$20 billion in 2017 dollars

That's it? I would have expected more. I guess that price doesn't include planes or anything fun.