Citigroup Inc. is shedding approximately 53,000 more employees in the coming quarters as the banking giant struggles to steady itself after suffering massive losses from deteriorating debt. The New York-based bank, which has already reduced its assets by about 20 percent since the first quarter of the year, also plans to trim expenses by 19% in 2009 from third-quarter levels, to $50 billion. The company said it is shrinking its work force by 20% from its 2007 peak of 375,000. The company had already announced in October that it was eliminating about 22,000 jobs from that level.