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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Net income         $ 2,467 $ 1,960 $ 4,640 $ 1,888 $ 12,313 $ 10,955 $ 14,209
Less: Net income attributable to noncontrolling interest         (1) 0 0 0 0 (1) (1)
Net income attributable to Fannie Mae $ 5,035 $ 3,196 $ 2,946 $ 1,136 2,466 1,960 4,640 1,888 12,313 10,954 14,208
Dividends distributed or available for distribution to senior preferred stockholder (5,471) (2,977) (2,869) (919) (2,859) (2,202) (4,359) (1,796) (12,236) (11,216) (15,323)
Net income (loss) attributable to common stockholders (Note 11) $ (436) $ 219 $ 77 $ 217 $ (393) $ (242) $ 281 $ 92 $ 77 $ (262) $ (1,115)
Weighted-average common shares outstanding: Basic 5,762 5,762 5,762 5,762 5,762 5,762 5,762 5,762 5,762 5,762 5,762
Convertible preferred stock                 131 0 0
Weighted-average common shares outstanding: Diluted 5,762 5,893 5,893 5,893 5,762 5,762 5,893 5,893 5,893 5,762 5,762
Earnings (loss) per share: Basic                 $ 0.01 $ (0.05) $ (0.19)
Earnings (loss) per share: Diluted $ (0.08) $ 0.04 $ 0.01 $ 0.04 $ (0.07) $ (0.04) $ 0.05 $ 0.02 $ 0.01 $ (0.05) $ (0.19)
Weighted-average shares of common stock that would be issued upon the full exercise of the warrant issued to Treasury                 4,600 4,600 4,600