Yes, Wagner was a big influence on Debussy (covered well in "Afternoon of a Faun" by Snyder). Some say was an obsession. For example, to find what to do after Tristan. Prelude.

Debussy wrote in 1910 - I am neither revolutionizing nor demolishing anything. I am quietly forging my own way ahead without any trace of propaganda for my ideas - as is proper for a revolutionary. I am no longer an adversary of Wagner. Wagner is a genius but geniuses can make mistakes. Wagner pronounced himself in favor of the laws of harmony. I am for freedom. But freedom must essentially be free".

I play a lot of Debussy. His art is wonderful.

Note that March 25 will be 100 years since he died.