Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net cash provided by (used in) operating activities
Net cash used in operating activities	$ 2,673	$ (3,111)
Cash flows provided by investing activities:
Proceeds from maturities and paydowns of trading securities held for investment	579	975
Proceeds from sales of trading securities held for investment	66	792
Proceeds from maturities and paydowns of available-for-sale securities	594	883
Proceeds from sales of available-for-sale securities	151	3,802
Purchases of loans held for investment	(41,206)	(39,935)
Net change in restricted cash	9,632	(2,994)
Advances to lenders	(28,703)	(25,635)
Proceeds from disposition of acquired property and preforeclosure sales	3,454	4,129
Net change in federal funds sold and securities purchased under agreements to resell or similar arrangements	(4,845)	9,800
Other, net	(330)	(545)
Net cash provided by investing activities	43,525	61,816
Cash flows used in financing activities:
Payments of cash dividends on senior preferred stock to Treasury	(5,471)	(2,859)
Other, net	185	(58)
Net cash used in financing activities	(46,434)	(54,463)
Net increase (decrease) in cash and cash equivalents	(236)	4,242
Cash and cash equivalents at beginning of period	25,224	14,674
Cash and cash equivalents at end of period	24,988	18,916
Cash paid during the period for:
Interest	25,954	26,013
Income taxes	0	360
Fannie Mae [Member]
Cash flows provided by investing activities:
Proceeds from repayments of loans acquired as held for investment	6,718	5,026
Proceeds from sales of loans acquired as held for investment of Fannie Mae	0	849
Cash flows used in financing activities:
Proceeds from issuance of debt	230,272	180,322
Payments to redeem debt	(230,655)	(196,016)
Consolidated Trusts [Member]
Cash flows provided by investing activities:
Proceeds from repayments of loans acquired as held for investment	97,415	104,669
Cash flows used in financing activities:
Proceeds from issuance of debt	78,443	71,723
Payments to redeem debt	$ (119,208)	$ (107,575)