Target Corp. is bringing in PepsiCo Inc. executive Brian Cornell as its new chief executive, turning to an outsider for the first time in its history to repair a battered corporate culture and navigate a sea change in Americans’ shopping habits. Reuters Brian Cornell will become chief executive of Target Corp. Mr. Cornell, age 55, steps into the role vacated three months ago by Gregg Steinhafel, a Target veteran who left after a revolt by key lieutenants who worried the cheap-chic discount retailer had lost its way.