Citigroup Inc plans to name John Havens as president and chief operating officer as part of a structural overhaul to address the bank's efforts to expand, the Wall Street Journal said.The promotion of Havens, a longtime colleague of Chief Executive Vikram Pandit, will cut the number of executives reporting directly to Pandit by half from a current 18, the Journal said, citing people familiar with the matter.The new lineup could also speed up decision making, the sources told the paper.Read More... More on Citibank