BoA expects to close the deal, which gives Ameriprise an additional $165 billion in assets under management, by the spring of next year.
Analysts had valued the entire asset management business at Columbia for as much as $3.5 billion.
Commenting on the decision to sell the unit, BoA CFO Joe Price said, “The acquisition of Merrill Lynch provided an opportunity to look at our entire portfolio of businesses with an eye toward strengthening our capital position while ensuring that we continue to offer the broadest possible solutions to our customers and clients as one of the world’s leading financial services firms.”