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CECL (Details 16) - CHF (SFr)
SFr in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Other financial assets, held at amortized cost, Allowance for Credit Loss [Line Items]          
Purchases SFr 230 SFr 151 SFr 32 SFr 381 SFr 32
Bank          
Other financial assets, held at amortized cost, Allowance for Credit Loss [Line Items]          
Purchases       SFr 381 SFr 32