NEW YORK, June 10 (Reuters) - The Federal Reserve’s balance sheet topped $8 trillion for the first time, weekly data published on Thursday by the central bank on its holdings showed. The report also showed the Fed appears to have sold around $160 million of its corporate debt holdings since Monday, following the announcement it would unwind its nearly $14 billion corporate credit portfolio. As a first step, the central bank began selling its stakes in 16 bond exchange-traded funds on Monday. (Reporting by Kate Duguid) Our Standards: The Thomson Reuters Trust Principles.