BOA as such subpoenaed after denying information

NEW YORK (CNN) -- Bank of America's chief executive officer spent four hours Thursday testifying in an investigation into the $3.6 billion in bonuses that Merrill Lynch paid out just before it was acquired by the bank last year, but still refused to give out the details of those payments.

Kenneth Lewis prepares to enter the offices of Attorney General Andrew Cuomo on Thursday in New York City.

The New York Attorney General's Office served a subpoena on Bank of America during chief executive Kenneth Lewis' testimony Thursday evening, seeking the full list of individual bonus recipients at Merrill Lynch, according to Benjamin M. Lawsky, a special assistant to Attorney General Andrew Cuomo.

"We obviously wanted to question Mr. Lewis about this list and are very disappointed that Bank of America has chosen not to produce it. As a result, during the testimony this evening, we served a subpoena on Bank of America for the list, which we intend to obtain," Lawsky said in a written statement.

Lewis, speaking to reporters as he left the attorney general's office after his testimony, said that he had come to "deliver clarity" and that he answered the questions that were asked to the best of his knowledge, but refused to take any questions about the details of the deposition.

Bank of America has been allocated $45 billion of federal bailout funds, and the Treasury has guaranteed to protect Bank of American against potentially billions of dollars in losses from investments Merrill Lynch made in real estate loans.

Former Merrill Lynch Chief Executive John Thain told investigators last week that Lewis was aware Merrill employees would be awarded billions of dollars in bonuses before Bank of America's takeover of Merrill became effective January 1, according to sources familiar with the investigation.