Sub-Select with MAX / SUM / INNER JOIN?

I need to make a SUM within MAX to return the highest product billing within a summary.

I was able to do this:

SELECT MAX(Faturamento) MAX_Faturamento 
FROM (SELECT SUM(P.preco * I.qtde) Faturamento 
    FROM produto P 
    INNER JOIN itens I ON P.cod_prod = I.cod_prod 
    GROUP BY P.descricao) AS tabela_aux;

But I also need to bring the description of the product, only the product that had the highest billing. I tried using this:

SELECT Descricao, MAX(Faturamento) MAX_Faturamento 
FROM (SELECT P.descricao, SUM(P.preco * I.qtde) Faturamento 
    FROM produto P INNER JOIN itens I ON P.cod_prod = I.cod_prod 
    GROUP BY P.descricao) AS tabela_aux 
GROUP BY Descricao;'

But it returns all the records and I only need the one that had the highest billing.