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CECL - Financial instruments measured at amortized cost and credit losses (Details 1) - CHF (SFr) SFr in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Overview of financial instruments measured at amortized cost, by balance sheet position [Line Items] |  |
Accrued interest excluded from amortized cost base of total Financial assets held-at-amortized cost, before allowance of credit losses | SFr 592 | SFr 549
Allowance for credit losses on accrued interest excluded from amortized cost base of total Financial assets held at amortized cost | 0 | 0
Accrued interest excluded from amortized cost base of total Interest-bearing deposits with banks | 1 | 1
Accrued interest excluded from amortized cost base of total Securities purchased under resale agreements and securities borrowing transactions |  | 4
Accrued interest excluded from amortized cost base of total Debt securities held-to-maturity | 18 | 10
Accrued interest excluded from amortized cost base of total Loans held at amortized cost | 573 | 534
Financing Receivables,Accrued Interest on Nonaccrual Loans Included | SFr 106 | SFr 102

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- Definition Amount, before allowance for credit loss, of accrued interest on investment in 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 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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