JPMorgan Chase & Co., the biggest U.S. bank, said a previously disclosed data breach of its systems affected 76 million households and 7 million small businesses.

Customer names, addresses, phone numbers and e-mail addresses were taken, the New York-based bank said today in a regulatory filing. Internal bank information "relating to such users" also was compromised, the company said.

"There is no evidence that account information for such affected customers — account numbers, passwords, user IDs, dates of birth or Social Security numbers — was compromised during this attack," the company said.