While I was employeed with Pennzoil, one of my jobs was Wal-Mart training for the stores in Wisconsin that used either Pennzoil or Quaker State.
They do not change transmission by any means. They will add if it is low. Whatever the featured oil is, is the brand of transmission fluid they use.
They do not touch the brake fluid and will only add coolant to the overflow bottle if needed.
They will change your oil, grease your fittings if you have any, add gear oil if needed, and air your tires. Oh, they also add washer fluid if needed, and will change out light bulbs.
Their bulk oil tanks are 500 gallons each of 5W30 and 10W30, and their ATF, gear oil, and grease are in 120 Lb kegs. If you want to know where this bulk equipment is, it's behind the wall of batteries in the TLE across from the counter.
This is the last place I would take my car. They change employees like I change underware. And don't ask for graphics.