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Related parties - Bank (Details 4) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liabilities and equity      
Other liabilities SFr 14,738 SFr 16,826  
Related party revenues and expenses      
Net revenues 19,890 15,213 SFr 23,042
Related Party [Member]      
Assets      
Cash and due from banks 418 0  
Central bank funds sold, securities purchased under resale agreements and securities borrowing transactions 376 0  
Trading assets 111 42  
Net loans 1,251 3,949  
Other assets 796 86  
Total assets 2,952 4,077  
Liabilities and equity      
Due to banks/customer deposits 1,020 1,320  
Central bank funds purchased, securities sold under repurchase agreements and securities lending transactions 343 91  
Trading liabilities 67 0  
Short-term borrowings 4,000 2,075  
Long-term debt 48,843 56,822  
Other Liabilities, Related Parties 1,865 1,284  
Other liabilities 56,138 61,592  
Related party revenues and expenses      
Interest and dividend income 114 13 (56)
Interest expense (3,927) (2,506) (1,673)
Net interest income (3,813) (2,493) (1,729)
Commissions and fees 17 82 102
Other revenues 14,354 246 212
Net revenues 10,558 (2,165) (1,415)
Total operating expenses 2,497 2,326 SFr 2,089
Related party guarantees      
Revocable loan commitments 32 59  
Credit guarantees and similar instruments | Related Party [Member]      
Related party guarantees      
Guarantees SFr 0 SFr 4