American International Group Inc., the insurer majority owned by the U.S. government after a 2008 bailout, issued $750 million in debt as an auction of $1.7 billion of its assets was resumed by the Federal Reserve, the data show. The New York-based company sold 4.875 percent, 10-year bonds at a spread of 325 basis points, the data show. Citigroup Inc. bought the mortgage-tied securities from the Federal Reserve Bank of New York, the district bank said yesterday.