v3.10.0.1
Document and Entity Information
9 Months Ended
Sep. 30, 2018
shares
Entity [Abstract]  
Entity Registrant Name FEDERAL NATIONAL MORTGAGE ASSOCIATION FANNIE MAE
Entity Central Index Key 0000310522
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Document Type 10-Q
Document Period End Date Sep. 30, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus Q3
Amendment Flag false
Entity Emerging Growth Company false
Entity Small Business false
Entity Common Stock, Shares Outstanding 1,158,087,567