Investments in Securities - Investments In Trading Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 52,552	$ 50,129
Mortgage-related
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	4,770	3,211
Mortgage-related \| Consolidated Trusts
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	364	427
Non-mortgage-related securities
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	47,782	46,918
Non-mortgage-related securities \| Pledged as collateral
Schedule of Investments in Trading Securities [Line Items]
Trading, at fair value	$ 5,700	$ 3,900

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483467/210-10-45-1

Name:	us-gaap_TradingSecuritiesDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant