The United States spends more than 80 billion US dollars (£50.2 billion) a year on its intelligence services, according to figures released for the first time.
Around 27 billion US dollars (£17 billion) goes to military intelligence.
Steven Aftergood, a secrecy specialist at the Federation of American Scientists, said the official figures were "the most complete disclosure we have ever had".
It is something the new director of national intelligence James Clapper had promised to push for.
His office said its share is 53.1 billion US dollars (£33.3 billion), which covers the CIA and some of the other 16 intelligence agencies.