BP will push decision-making closer to the "frontline" and seek greater financial accountability and discipline, said Meg O'Neill, the British energy giant's new CEO, on the social-media platform Linkedin on Thursday.

After 100 days in her position, O'Neill said BP needs to be made simpler, with "clear accountability, decisions closer to the frontline--where work-- happens-and less complexity."

Accordingly, BP has been simplified into two businesses, "Upstream and Downstream, with trading connecting both to create value," said O'Neill.

BP is also reducing costs, maintaining tight discipline on capex, strengthening the balance sheet, and instituting "financial discipline," added O'Neill.