Bloomberg explains what happened overnight.

Excepts:

Wachovia will be left with its retail brokerage and Evergreen asset management units. The brokerage has about 14,600 financial advisers and more than $1 trillion under management, making it third in the U.S. behind Merrill Lynch & Co. and Citigroup’s Smith Barney unit.

and:

The transaction is likely to hurt Charlotte, where Wachovia is the largest private employer with about 20,000 workers, said Michael Nix, portfolio manager at Greenwood Capital Associates LLC in Greenwood, South Carolina. The bank said today in a statement that the corporate headquarters will stay in Charlotte.