The largest physical check ever written.
A few weeks prior to TARP, Goldman Sachs went to Warren Buffett for $10 billion and Morgan Stanley found a bailout partner in Mitsubishi.
Morgan Stanley received a $9 billion investment from Mitsubishi UFJ in the fall of 2008 that kept the firm from collapsing. The payment was supposed to be wired electronically, but because it needed to be made on an emergency basis on a holiday, Mitsubishi cut a physical check, perhaps the largest ever written.
That's $9,000,000,000.