Commitments, Contingencies and Guarantees Commitments, Contingencies and Guarantees (Narrative) (Details) $ in Millions	Mar. 31, 2026 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 1,300

Amount of advance from Federal Home Loan Bank (FHLBank).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478878/942-470-45-1

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