Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows provided by (used in) operating activities:
Net cash provided by (used in) operating activities	$ 4,802	$ 24,135
Cash flows provided by investing activities:
Purchases of trading securities held for investment	(3,985)	(1,095)
Proceeds from maturities and paydowns of trading securities held for investment	1,293	1,763
Proceeds from sales of trading securities held for investment	4,469	693
Purchases of available-for-sale securities	0	(25)
Proceeds from maturities and paydowns of available-for-sale securities	5,861	5,972
Proceeds from sales of available-for-sale securities	2,021	696
Purchases of loans held for investment	(119,122)	(81,192)
Net change in restricted cash	13,989	(5,188)
Advances to lenders	(76,435)	(56,489)
Proceeds from disposition of acquired property and preforeclosure sales	22,466	20,570
Net change in federal funds sold and securities purchased under agreements to resell or similar arrangements	(5,300)	22,000
Other, net	170	(92)
Net cash provided by investing activities	269,161	276,959
Cash flows used in financing activities:
Payments of cash dividends on senior preferred stock to Treasury	(63,592)	(5,750)
Proceeds from senior preferred stock purchase agreement with Treasury	0	4,571
Other, net	(2)	145
Net cash used in financing activities	(270,362)	(293,905)
Net increase (decrease) in cash and cash equivalents	3,601	7,189
Cash and cash equivalents at beginning of period	21,117	17,539
Cash and cash equivalents at end of period	24,718	24,728
Cash paid during the period for:
Interest	55,455	60,926
Income Taxes	1,016	0
Fannie Mae [Member]
Cash flows provided by investing activities:
Proceeds from repayments of loans held for investment	28,762	14,236
Cash flows used in financing activities:
Proceeds from the issuance of debt	248,901	337,683
Payments to redeem debt	(261,959)	(408,557)
Consolidated Trusts [Member]
Cash flows provided by investing activities:
Proceeds from repayments of loans held for investment	394,972	355,110
Cash flows used in financing activities:
Proceeds from the issuance of debt	235,835	160,523
Payments to redeem debt	$ (429,545)	$ (382,520)