Updated: See below.

The number most commonly-associated with the federal government's role in bailing out the nation's banks (and various other institutions that move money around the economy) is $700 billion -- the amount authorized by Congress for the Treasury Department to spend on...well, that keeps changing...banks generally. But, according to a tally by Bloomberg News, to date, the federal government has put $7.76 trillion of taxpayer funds on the line to shore up the nation's financial network.

The unprecedented pledge of funds includes $3.18 trillion already tapped by financial institutions in the biggest response to an economic emergency since the New Deal of the 1930s, according to data compiled by Bloomberg. The commitment dwarfs the plan approved by lawmakers, the Treasury Department's $700 billion Troubled Asset Relief Program. Federal Reserve lending last week was 1,900 times the weekly average for the three years before the crisis.

When Congress approved the TARP on Oct. 3, Fed Chairman Ben S. Bernanke and Treasury Secretary Henry Paulson acknowledged the need for transparency and oversight. Now, as regulators commit far more money while refusing to disclose loan recipients or reveal the collateral they are taking in return, some Congress members are calling for the Fed to be reined in.

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Bloomberg News tabulated data from the Fed, Treasury and Federal Deposit Insurance Corp. and interviewed regulatory officials, economists and academic researchers to gauge the full extent of the government's rescue effort.

The bailout includes a Fed program to buy as much as $2.4 trillion in short-term notes, called commercial paper, that companies use to pay bills, begun Oct. 27, and $1.4 trillion from the FDIC to guarantee bank-to-bank loans, started Oct. 14.

And if you thought the lack of transparency around Treasury's Troubled Asset Relief Program was disconcerting, this quote from Fed Chair Ben Bernanke will have you reaching for your favorite antacid:

"Some have asked us to reveal the names of the banks that are borrowing, how much they are borrowing, what collateral they are posting," Bernanke said Nov. 18 to the House Financial Services Committee. "We think that's counterproductive."

Update: Spoke too soon! Make that $8.56 trillion:

The United States government unveiled $800 billion worth of new loans and debt purchases on Tuesday [Nov. 25], hoping another massive infusion of cash would smooth troubled credit markets and make borrowing easier for homebuyers, small businesses and students.

The Federal Reserve said it would buy up to $600 billion in mortgage-backed assets from government-sponsored mortgage giants Fannie Mae and Freddie Mac. It would buy up to $100 billion in debt directly from the companies and up to $500 billion in mortgage-backed securities.

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Separately, the Fed and Treasury Department announced a $200 billion program to ease commercial lending on debt like student loans, car loans or business loans. The Fed would lend up to $200 billion to holders of asset-backed securities supported by car loans, credit card loans, student loans, and business loans guaranteed by the Small Business Administration.

Image by Flickr user jurek d. used under a Creative Commons license.