Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Assets:
Restricted cash (includes $26,279 and $31,536, related to consolidated trusts)	$ 30,999	$ 36,953
Investments in securities:
Trading, at fair value (includes $1,007 and $1,277, respectively, pledged as collateral )	1,007	1,277
Available-for-sale, at fair value (includes $98 and $107, respectively, related to consolidated trusts)	6,408	8,363
Accrued interest receivable (includes $7,223 and $7,064, respectively, related to consolidated trusts)	7,840	7,737
Mortgage loans:
Total loans held for investment (includes $11,406 and $12,057, respectively, at fair value)	11,406	12,057
Liabilities:
Accrued interest payable (includes $8,389 and $8,285, respectively, related to consolidated trusts)	9,473	9,431
Other liabilities (includes $340 and $390, respectively, related to consolidated trusts)	$ 8,373	$ 10,150
Stockholders’ equity:
Senior preferred stock, 1,000,000 shares issued	1,000,000	1,000,000
Senior preferred stock, 1,000,000 shares outstanding	1,000,000	1,000,000
Preferred stock, 700,000,000 shares are authorized	700,000,000	700,000,000
Preferred stock, 555,374,922 shares issued	555,374,922	555,374,922
Preferred stock, 555,374,922 shares outstanding	555,374,922	555,374,922
Common stock, 1,308,762,703 shares issued	1,308,762,703	1,308,762,703
Common stock, 1,158,087,567 and 1,158,082,750 shares outstanding, respectively	1,158,087,567	1,158,082,750
Treasury stock, at cost, 150,675,136 shares	150,675,136	150,679,953
Consolidated Trusts [Member]
Assets:
Restricted cash (includes $26,279 and $31,536, related to consolidated trusts)	$ 26,279	$ 31,536
Investments in securities:
Available-for-sale, at fair value (includes $98 and $107, respectively, related to consolidated trusts)	98	107
Accrued interest receivable (includes $7,223 and $7,064, respectively, related to consolidated trusts)	7,223	7,064
Liabilities:
Accrued interest payable (includes $8,389 and $8,285, respectively, related to consolidated trusts)	8,389	8,285
Debt (includes $9,008 and $9,582, respectively, of debt of Fannie Mae at fair value and $34,866 and $36,524, respectively, of debt of consolidated trusts, at fair value)	34,866	36,524
Other liabilities (includes $340 and $390, respectively, related to consolidated trusts)	340	390
Fannie Mae [Member]
Liabilities:
Debt (includes $9,008 and $9,582, respectively, of debt of Fannie Mae at fair value and $34,866 and $36,524, respectively, of debt of consolidated trusts, at fair value)	$ 9,008	$ 9,582