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CECL - Financial instruments measured at amortized cost and credit losses (Details 1) - CHF (SFr)
SFr in Millions
Dec. 31, 2023
Dec. 31, 2022
Overview of financial instruments measured at amortized cost, by balance sheet position [Line Items]    
Collateral Dependent Financial Assets, Collateral Coverage Ratio, Recovery Mgt Investment Bank/Asia Pacific 98.00% 94.00%
Collateral Dependent Financial Assets, Collateral Coverage Ratio, Recovery Mgt International Wealth Management 93.00% 92.00%
Collateral Dependent Financial Assets, Collateral Coverage Ratio, Recovery Mgt Swiss Universal Bank 84.00% 88.00%
Accrued interest excluded from amortized cost base of total Financial assets held-at-amortized cost, before allowance of credit losses SFr 465 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 3 4
Accrued interest excluded from amortized cost base of total Debt securities held-to-maturity 19 10
Accrued interest excluded from amortized cost base of total Loans held at amortized cost 442 534
Financing Receivables,Accrued Interest on Nonaccrual Loans Included SFr 88 SFr 102