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Investment securities - Maturities of amortized costs/FV/Avg yield (Details 6) - CHF (SFr)
SFr in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Due within 1 year, amortized cost SFr 4  
Due from 1 to 5 years, amortized cost 0  
Total, amortized cost, before allowance for credit losses 4 SFr 952
Due within 1 year, fair value 4  
Due from 1 to 5 years, fair value 0  
Total, fair value SFr 4 796
Due within 1 year, average yield (as a percent) 33.55%  
Due from 1 to 5 years, average yield (as a percent) 0.00%  
Total, average yield (as a percent) 33.55%  
Debt Securities Available-for-Sale Financing Receivable, Accrued Interest, Before Allowance for Credit Loss SFr 0 SFr 1