Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets:
Restricted cash (includes $19,216 and $17,849, respectively, related to consolidated trusts)	$ 24,745	$ 23,866
Investments in securities:
Trading, at fair value (includes $2,922 and $3,061, respectively, pledged as collateral)	2,922	3,061
Available-for-sale, at fair value	3,214	3,429
Accrued interest receivable, net (includes $8,390 and $7,928, respectively, related to consolidated trusts)	8,926	8,490
Mortgage loans:
Total loans held for investment (includes $8,753 and $8,922, respectively, at fair value)	8,752	8,922
Liabilities:
Accrued interest payable (includes $9,221 and $9,133, respectively, related to consolidated trusts)	10,364	10,211
Other liabilities (includes $343 and $356, respectively, related to consolidated trusts)	$ 10,299	$ 9,947
Fannie Mae stockholders’ equity (deficit):
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 shares outstanding	1,158,087,567	1,158,087,567
Treasury stock, at cost, 150,675,136 shares	150,675,136	150,675,136
Consolidated Trusts [Member]
Assets:
Restricted cash (includes $19,216 and $17,849, respectively, related to consolidated trusts)	$ 19,216	$ 17,849
Investments in securities:
Accrued interest receivable, net (includes $8,390 and $7,928, respectively, related to consolidated trusts)	8,390	7,928
Liabilities:
Accrued interest payable (includes $9,221 and $9,133, respectively, related to consolidated trusts)	9,221	9,133
Debt (includes $6,682 and $6,826, respectively, of debt of Fannie Mae at fair value and $23,050 and $23,753, respectively, of debt of consolidated trusts, at fair value)	23,050	23,753
Other liabilities (includes $343 and $356, respectively, related to consolidated trusts)	343	356
Fannie Mae [Member]
Liabilities:
Debt (includes $6,682 and $6,826, respectively, of debt of Fannie Mae at fair value and $23,050 and $23,753, respectively, of debt of consolidated trusts, at fair value)	$ 6,682	$ 6,826