Tell me if these are brands or companies: Kleenex, Procter & Gamble, Cadillac, Doritos, Chase?
It can be difficult to know if something is a brand or a company.  You asked about a few specific brands and companies.  Here is what is a brand and what is a company from the list that you gave me:

Kleenex is a brand.  The Kleenex brand is owned by the company, Kimberly-Clark

Procter & Gamble is a company.  Procter & Gamble owns many brands.  One famous brand of Procter & Gamble is Crest.

Cadillac is a brand.  The Cadillac brand is owned by General Motors.

Doritos is a brand.  Doritos is one of the brands of Frito-Lay, a wholly owned subsidiary of PepsiCo.  

Chase is a company.  To be very specific, JPMorgan Chase Bank, N.A., is a company  doing business as Chase. 

I hope this list helps you!