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Assets under management - Change (Details 2) - CHF (SFr)
SFr in Billions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Changes in Assets under management    
Assets under management at beginning of period SFr 1,614.0 SFr 1,511.9
Net new assets/(net asset outflows) (123.2) 30.9
Market movements, interest, dividends and foreign exchange (170.0) 92.6
of which market movements, interest and dividends (165.9) 80.8
of which foreign exchange (4.1) 11.8
Other effects (27.2) (21.4)
Assets under management at end of period 1,293.6 1,614.0
Bank    
Changes in Assets under management    
Assets under management at beginning of period 1,611.0 1,507.0
Net new assets/(net asset outflows) (122.5) 33.2
Market movements, interest, dividends and foreign exchange (169.9) 92.4
of which market movements, interest and dividends (165.9) 80.7
of which foreign exchange (4.0) 11.7
Other effects (27.1) (21.6)
Assets under management at end of period SFr 1,291.5 SFr 1,611.0