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CECL (Details 8) - CHF (SFr)
SFr in Millions
Jun. 30, 2023
Dec. 31, 2022
Financial Asset, Past Due [Member]    
Debt Securities Held-To-Maturity, Amortized Cost, Past Due [Line Items]    
Total debt securities held-to-maturity, amortized cost SFr 0 SFr 0