It has been six years since Lehman Brothers Holdings Inc. collapsed, plunging the global economy into chaos, but the work of unwinding the largest bankruptcy in U.S. history still isn't finished, the Wall Street Journal reported today. The professionals unraveling the failed investment bank now expect to recover about $88.8 billion for creditors, who are owed an estimated $341 billion. So far, Lehman's parent company and its units have paid out $57.1 billion to unsecured creditors, excluding Lehman affiliates. While its New York-based holding company officially exited bankruptcy in 2012, Lehman's liquidation process is expected to continue for several more years.