Walmart is on the verge of becoming a $1 trillion company.The holiday season is a great time for retail stocks, but not all of them carry that rally into the new year. And then some retailers continue to post excellent sales numbers regardless of the time of year. Walmart (WMT 1.63%) is in that category.It's the everything store for a lot of people. Walmart's global e-commerce sales continue to grow, and online ads are boosting its profit margins.Walmart's store locations assist with e-commerce growth Walma ...