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Segment Reporting (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Net accrual of periodic settlements $ 4,769 $ 5,067
Benefit for credit losses 1,184 533
Net interest income (loss) after benefit for credit losses 5,953 5,600
Guaranty fee income (expense) 25 31
Investment gains (losses), net 69 342
Fair value gains (losses), net (2,813) (1,919)
Gains (losses) from partnership investments 1 207
Fee and other income (expense) 178 277
Administrative expenses (688) (723)
Foreclosed property income (expense) (334) (473)
TCCA fees (440) (382)
Other income (expenses), net (265) (202)
Income (loss) before federal income taxes 1,686 2,758
(Provision) benefit for federal income taxes (550) (870)
Net income (loss) attributable to Fannie Mae 1,136 1,888
US Treasury [Member]    
Segment Reporting Information [Line Items]    
TCCA fees (440) (382)
Business Segments [Member] | Single-Family [Member]    
Segment Reporting Information [Line Items]    
Net accrual of periodic settlements 143 9
Benefit for credit losses 1,163 478
Net interest income (loss) after benefit for credit losses 1,306 487
Guaranty fee income (expense) 3,222 3,040
Investment gains (losses), net (1) 0
Fair value gains (losses), net 0 (4)
Gains (losses) from partnership investments (19) (5)
Fee and other income (expense) 101 172
Administrative expenses (508) (484)
Foreclosed property income (expense) (335) (485)
Other income (expenses), net (303) (227)
Income (loss) before federal income taxes 3,023 2,112
(Provision) benefit for federal income taxes (643) (581)
Net income (loss) attributable to Fannie Mae 2,380 1,531
Business Segments [Member] | Single-Family [Member] | US Treasury [Member]    
Segment Reporting Information [Line Items]    
TCCA fees (440) (382)
Business Segments [Member] | Multifamily [Member]    
Segment Reporting Information [Line Items]    
Net accrual of periodic settlements (25) (31)
Benefit for credit losses 21 55
Net interest income (loss) after benefit for credit losses (4) 24
Guaranty fee income (expense) 385 340
Investment gains (losses), net 3 9
Fair value gains (losses), net 0 0
Gains (losses) from partnership investments 20 212
Fee and other income (expense) 59 51
Administrative expenses (84) (88)
Foreclosed property income (expense) 1 12
Other income (expenses), net (9) (7)
Income (loss) before federal income taxes 371 553
(Provision) benefit for federal income taxes (38) (70)
Net income (loss) attributable to Fannie Mae 333 483
Business Segments [Member] | Capital Markets [Member]    
Segment Reporting Information [Line Items]    
Net accrual of periodic settlements 1,092 1,602
Benefit for credit losses 0 0
Net interest income (loss) after benefit for credit losses 1,092 1,602
Guaranty fee expense (195) (227)
Investment gains (losses), net 1,415 1,509
Fair value gains (losses), net (2,803) (1,970)
Gains (losses) from partnership investments 0 0
Fee and other income (expense) 21 55
Administrative expenses (96) (151)
Foreclosed property income (expense) 0 0
Other income (expenses), net (29) 0
Income (loss) before federal income taxes (595) 818
(Provision) benefit for federal income taxes 131 (219)
Net income (loss) attributable to Fannie Mae (464) 599
Reconciling Items [Member]    
Segment Reporting Information [Line Items]    
Net accrual of periodic settlements 3,559 3,487
Benefit for credit losses 0 0
Net interest income (loss) after benefit for credit losses 3,559 3,487
Guaranty fee expense (3,387) (3,122)
Investment gains (losses), net (1,348) (1,176)
Fair value gains (losses), net (10) 55
Gains (losses) from partnership investments 0 0
Fee and other income (expense) (3) (1)
Administrative expenses 0 0
Foreclosed property income (expense) 0 0
Other income (expenses), net 76 32
Income (loss) before federal income taxes (1,113) (725)
(Provision) benefit for federal income taxes 0 0
Net income (loss) attributable to Fannie Mae $ (1,113) $ (725)