Wal-Mart's acquisition of Jet.com was in some ways a return to basics for the world's largest retailer.

"If Wal-Mart were starting today and we were building an e-commerce business some of the things that Jet designed into their approach would have been things we would have thought of and we would have wanted to do, and they've just done it from scratch," Wal-Mart CEO Doug McMillon told CNBC's "Squawk Box."