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Investment securities - Maturities of amortized costs/FV/Avg yield (Details 6) - CHF (SFr)
SFr in Millions
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Due within 1 year, amortized cost SFr 8  
Due from 1 to 5 years, amortized cost 285  
Due from 5 to 10 years, amortized cost 711  
Total, amortized cost, before allowance for credit losses 1,004 SFr 952
Due within 1 year, fair value 8  
Due from 1 to 5 years, fair value 251  
Due from 5 to 10 years, fair value 595  
Total, fair value SFr 854 796
Due within 1 year, average yield (as a percent) 0.53%  
Due from 1 to 5 years, average yield (as a percent) 0.14%  
Due from 5 to 10 years, average yield (as a percent) 0.70%  
Total, average yield (as a percent) 0.54%  
Debt Securities Available-for-Sale Financing Receivable, Accrued Interest, Before Allowance for Credit Loss SFr 4 SFr 1