If I am married, filing jointly, and my long-term capital gains exceeds the 15% limit how is it taxed exactly?

If my long term capital gains exceeds the 15% limit of $488,850....... Will the balance below the $488,850 be taxed at 15% and everything over that amount at 20% or will the entire balance be taxed at 20%? I can't seem to find this answer anywhere.