The most detailed public disclosure of American intelligence spending in history shows a surprisingly dominant role for the Central Intelligence Agency, a growing emphasis on both defensive and offensive cyberoperations, and significant gaps in knowledge about targeted countries despite the sharp increase in spending after the 2001 terrorist attacks.

The top secret budget request for the current fiscal year was obtained by The Washington Post from the former National Security Agency contractor Edward J. Snowden and published in part on its Web site on Thursday. The newspaper said it was withholding most of the 178-page document at the request of government officials because “sensitive details are so pervasive” in its description of spying programs.

The document shows that the agencies’ budget request for the year ending Sept. 30 was $52.6 billion, a small decrease from the 2011 peak of $54.6 billion, which came after a decade of rapid spending growth. Of that, the biggest share was taken by the C.I.A., which carries out traditional human spying and intelligence analysis but also now conducts drone strikes against terrorism suspects in Pakistan and Yemen.

The C.I.A. asked for $14.7 billion, significantly outpacing the two big technological spy agencies, the eavesdropping N.S.A., which sought $10.8 billion, and the National Reconnaissance Office, which operates surveillance satellites and sought $10.3 billion. While the document reflects the money requested for the 2013 fiscal year and not what was actually received, the record of past expenditures suggests that real spending this year is probably very close to the amount requested.