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The goal of Kant's "Refutation of Idealism" is to show that his view is significantly different from Berkeley's view. Berkeley's view is a version of what Kant calls "material idealism", and Kant's view is "transcendental idealism".

B275-6 "Thesis of the refutation of idealism:

The mere, but empirically determined, consciousness of my own existence proves the existence of objects in space outside me.

Proof:

• I am conscious of my own existence as determined in time.
• All determination of time presupposes something permanent in perception.
• This permanent cannot, however, be something in me, since it is only through this permanent that my existence in time can itself be determined.
• Thus perception of this permanent is possible only through a thing outside me and not through the mere representation of a thing outside me; and consequently the determination of my existence in time is possible only through the existence of actual things which I perceive outside me.
• . . .
• In other words, the consciousness of my existence is at the same time an immediate consciousness of the existence of other things outside me."

The Distinction of all objects in general into phenomena and noumena:

The Cold Comfort Objection: Kant shows us (at best, assuming that all of his arguments succeed) that we know how things seem to us but not how things really are. That is cold comfort at best. To really answer the Humean skeptic, one has to show us that we know things as they really are, not just how they seem.