Capital (Mandatorily Redeemable Capital Stock) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Banking Regulation, Total Capital [Abstract]
Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Two	$ 0	$ 5
Financial Instruments Subject to Mandatory Redemption, Past Contractual Redemption Date, Due to Outstanding Activity	3	4
Financial Instruments Subject to Mandatory Redemption	30	9	$ 12	$ 15
MRCS Interest Expense	3	1	$ 1
Financial Instruments Subject to Mandatory Redemption, Redeemable within One year	4	0
Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Five	$ 23	$ 0

No definition available.

Name:	us-gaap_CapitalAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of mandatorily redeemable capital stock past the contractual redemption date due to outstanding activity.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancialInstrumentsSubjectToMandatoryRedemptionPastContractualRedemptionDateDueToOutstandingActivity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of mandatorily redeemable capital stock maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of mandatorily redeemable capital stock maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of mandatorily redeemable capital stock maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableWithinOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest expense incurred during the reporting period on capital securities issued by the reporting entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_InterestExpenseCapitalSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481648/480-10-50-2

+ Details

Name:	us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant