AIG had sold credit protection through its London unit in the form of credit default swaps (CDSs) on collateralized debt obligations (CDOs) but by 2008, they had declined in value. AIG's Financial Products division, headed by Joseph Cassano in London, had entered into credit default swaps to insure $441 billion worth of securities originally rated AAA. Of those securities, $57.8 billion were structured debt securities backed by subprime loans. As a result, AIG's credit rating was downgraded and it was required to post additional collateral with its trading counter-parties, leading to a liquidity crisis that began on September 16, 2008, and essentially bankrupted all of AIG. The New York United States Federal Reserve Bank (led by Timothy Geithner who would later become Treasury secretary) stepped in, announcing creation of a secured credit facility, initially of up to $85 billion to prevent the company's collapse, enabling AIG to deliver additional collateral to its credit default swap trading partners. The credit facility was secured by the stock in AIG-owned subsidiaries in the form of warrants for a 79.9% equity stake in the company and the right to suspend dividends to previously issued common and preferred stock. The AIG board accepted the terms of the Federal Reserve rescue package that same day, making it the largest government bailout of a private company in U.S. history.