Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Net cash provided by (used in) operating activities
Net cash provided by (used in) operating activities	$ 262	$ (3,982)
Cash flows provided by investing activities:
Proceeds from maturities and paydowns of trading securities held for investment	937	1,109
Proceeds from sales of trading securities held for investment	124	1,313
Proceeds from maturities and paydowns of available-for-sale securities	1,214	1,778
Proceeds from sales of available-for-sale securities	922	7,584
Purchases of loans held for investment	(90,180)	(97,024)
Net change in restricted cash	5,954	(6,818)
Advances to lenders	(57,533)	(57,956)
Proceeds from disposition of acquired property and preforeclosure sales	6,874	8,557
Net change in federal funds sold and securities purchased under agreements to resell or similar arrangements	1,195	5,025
Other, net	(208)	(661)
Net cash provided by investing activities	93,071	114,863
Cash flows used in financing activities:
Payments of cash dividends on senior preferred stock to Treasury	(8,250)	(3,778)
Other, net	11	30
Net cash used in financing activities	(101,653)	(101,936)
Net increase (decrease) in cash and cash equivalents	(8,320)	8,945
Cash and cash equivalents at beginning of period	25,224	14,674
Cash and cash equivalents at end of period	16,904	23,619
Cash paid during the period for:
Interest	56,207	52,354
Income taxes	1,070	610
Fannie Mae [Member]
Cash flows provided by investing activities:
Proceeds from repayments of loans acquired as held for investment	12,835	11,804
Proceeds from sales of loans acquired as held for investment of Fannie Mae	2,361	1,964
Cash flows used in financing activities:
Proceeds from issuance of debt	489,301	432,025
Payments to redeem debt	(514,228)	(456,586)
Consolidated Trusts [Member]
Cash flows provided by investing activities:
Proceeds from repayments of loans acquired as held for investment	208,576	238,188
Cash flows used in financing activities:
Proceeds from issuance of debt	181,764	171,004
Payments to redeem debt	$ (250,251)	$ (244,631)