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CECL (Details 5) SFr in Millions	6 Months Ended
	Jun. 30, 2023 CHF (SFr)
Debt securities issued by foreign governments
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Purchases	SFr 630

X

- Definition

Amount of increase from purchase of debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: