Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows provided by (used in) operating activities:
Net income	$ 12,923	$ 22,176	$ 11,805
Reconciliation of net income to net cash provided by (used in) operating activities:
Amortization of cost basis adjustments	(5,731)	(10,763)	(9,190)
Net impact of hedged mortgage assets and debt	(423)	(268)	0
Provision (benefit) for credit losses	6,277	(5,130)	678
Valuation (gains) losses	361	(1,996)	(2,618)
Current and deferred federal income taxes	(200)	300	3,152
Net gains related to the disposition of acquired property and preforeclosure sales, including credit enhancements	(1,782)	(1,780)	(924)
Net change in accrued interest receivable	(1,826)	(618)	(2,749)
Net change in servicer advances	(217)	(2,131)	932
Other, net	(343)	438	(361)
Net change in trading securities	34,787	46,983	(73,659)
Net cash provided by (used in) operating activities	43,826	47,211	(72,934)
Cash flows provided by investing activities:
Purchases of loans held for investment	(247,016)	(649,238)	(766,699)
Advances to lenders	(178,450)	(393,016)	(339,043)
Proceeds from disposition of acquired property and preforeclosure sales	2,694	3,536	5,991
Net change in federal funds sold and securities purchased under agreements to resell	6,178	7,457	(14,622)
Other, net	(1,103)	711	1,169
Net cash provided by investing activities	90,128	90,850	26,685
Cash flows provided by (used in) financing activities:
Other, net	0	69	(510)
Net cash provided by (used in) financing activities	(154,744)	(145,053)	100,465
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	(20,790)	(6,992)	54,216
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	108,631	115,623	61,407
Cash, cash equivalents and restricted cash and cash equivalents at end of period	87,841	108,631	115,623
Cash paid during the period for:
Interest	101,469	106,205	113,878
Income taxes	3,511	5,500	3,950
Non-cash activities:
Mortgage loans acquired by assuming debt or advances to lenders	185,205	398,026	369,733
Net transfers from mortgage loans of Fannie Mae to mortgage loans of consolidated trusts	265,066	663,849	709,451
Transfers from advances to lenders to loans held for investment of consolidated trusts	185,203	384,700	318,426
Net transfers from mortgage loans to acquired property	2,344	3,000	3,940
Fannie Mae
Cash flows provided by investing activities:
Proceeds from repayments of loans acquired as held for investment	7,609	11,212	10,672
Proceeds from sales of loans acquired as held for investment	7,501	17,130	8,744
Cash flows provided by (used in) financing activities:
Proceeds from the issuance of debt	340,708	317,867	580,220
Payments to redeem debt	(403,967)	(405,368)	(472,795)
Consolidated Trusts
Cash flows provided by investing activities:
Proceeds from repayments and sales of loans acquired as held for investment	492,715	1,093,058	1,120,473
Cash flows provided by (used in) financing activities:
Proceeds from the issuance of debt	469,955	1,097,497	1,091,242
Payments to redeem debt	$ (561,440)	$ (1,155,118)	$ (1,097,692)