GENEVA — Syria submitted a formal declaration of its chemical weapons program and its plans for destroying its arsenal three days ahead of the deadline, the international chemical weapons watchdog said Sunday.

The watchdog, the Organization for the Prohibition of Chemical Weapons, which has been charged with monitoring and destroying Syria’s chemical weapons program, said that it had received the Syrian submission on Thursday and that the agency’s Executive Council would review the declaration’s “general plan of destruction” by Nov. 15.

It was not immediately clear, however, whether the declaration’s listing of chemical weapons sites was exhaustive, an important test of President Bashar al-Assad’s willingness to cooperate with the program to eliminate Syria’s chemical weapons infrastructure and arsenal.

Saying that such declarations are confidential, the chemical weapons agency declined to disclose or discuss the contents of the Syrian document.