Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net Cash Provided by (Used in) Operating Activities	$ 6,235,000,000	$ 3,404,000,000
Cash flows from investing activities
Purchases of trading securities	(111,472,000,000)	(76,091,000,000)
Proceeds from sales of trading securities	86,603,000,000	61,398,000,000
Proceeds from maturities and repayments of trading securities	24,589,000,000	10,733,000,000
Purchases of available-for-sale securities	(7,851,000,000)	(6,440,000,000)
Proceeds from sales of available-for-sale securities	33,175,000,000	9,407,000,000
Proceeds from maturities and repayments of available-for-sale securities	2,650,000,000	3,201,000,000
Purchases of mortgage loans acquired as held-for-investment	(439,606,000,000)	(154,441,000,000)
Proceeds from sales of mortgage loans acquired as held-for-investment	7,725,000,000	11,063,000,000
Proceeds from repayments of mortgage loans acquired as held-for-investment	509,762,000,000	232,374,000,000
Advances under secured lending arrangements	(91,511,000,000)	(34,627,000,000)
Repayments of secured lending arrangements	1,406,000,000	1,022,000,000
Net proceeds from dispositions of real estate owned and other recoveries	585,000,000	891,000,000
Net (increase) decrease in securities purchased under agreements to resell	(36,189,000,000)	(16,416,000,000)
Derivative premiums and terminations, swap collateral, and exchange settlement payments, net	(9,891,000,000)	(10,536,000,000)
Other, net	(439,000,000)	(424,000,000)
Net Cash Provided by (Used in) Investing Activities	(30,464,000,000)	31,114,000,000
Cash flows from financing activities
Net increase (decrease) in securities sold under agreements to repurchase	(7,046,000,000)	2,713,000,000
Payment of cash dividends on senior preferred stock	0	(3,142,000,000)
Other, net	(45,000,000)	(84,000,000)
Net Cash Provided by (Used in) Financing Activities	27,114,000,000	(33,083,000,000)
Net increase (decrease) in cash and cash equivalents (includes restricted cash and cash equivalents)	2,885,000,000	1,435,000,000
Cash and cash equivalents (includes restricted cash and cash equivalents) at beginning of year	5,189,000,000	7,273,000,000
Cash and cash equivalents (includes restricted cash and cash equivalents) at end of period	8,074,000,000	8,708,000,000
Cash paid for:
Debt interest	53,045,000,000	52,720,000,000
Income taxes	740,000,000	306,000,000
Held by Freddie Mac
Cash flows from financing activities
Proceeds from issuance of debt	409,217,000,000	418,369,000,000
Repayments of debt	(396,053,000,000)	(394,777,000,000)
Held by consolidated trusts
Cash flows from financing activities
Proceeds from issuance of debt	502,025,000,000	178,248,000,000
Repayments of debt	(480,984,000,000)	$ (234,410,000,000)
Cash and cash equivalents (includes restricted cash and cash equivalents) at beginning of year	870,000,000
Cash and cash equivalents (includes restricted cash and cash equivalents) at end of period	$ 1,490,000,000