WASHINGTON — The Justice Department revealed on Thursday the existence of yet another database of American telephone records, adding new details to the disclosures in recent years about mass government surveillance.

This database was maintained by the Drug Enforcement Administration and contained the records of calls made between phone numbers in the United States and overseas. The phone records were retained even if there was no evidence the callers were involved in criminal activity.

The government stored the numbers, the time and date of the call and the length. But, the database did not include names or other personal identifying information or the content of the conversation. It contained records of calls between Americans and people in countries that had connections to international drug trafficking and related criminal activities.

Depending on how broadly the government interpreted that definition, it could have collected information on calls to many countries around the world.