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Segment information - Income statement related (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information      
Net revenues SFr 19,890 SFr 15,213 SFr 23,042
Gain From Write-down Of AT1 Capital Notes Relating To Credit Suisse Group AG 894    
Income/(loss) before taxes (3,260) (3,331) (91)
Switzerland      
Segment Reporting Information      
Net revenues 17,210 7,154 8,382
Income/(loss) before taxes 6,689 543 1,659
EMEA      
Segment Reporting Information      
Net revenues (1,488) 523 2,916
Income/(loss) before taxes (5,891) (2,907) (5,554)
Americas      
Segment Reporting Information      
Net revenues 4,270 6,134 8,896
Income/(loss) before taxes (1,312) 374 3,574
Asia Pacific      
Segment Reporting Information      
Net revenues (102) 1,402 2,848
Income/(loss) before taxes (2,746) (1,341) 230
Operating Segments [Member] | Wealth Management      
Segment Reporting Information      
Net revenues 3,058 4,904 5,549
Income/(loss) before taxes (3,206) 427 1,513
Operating Segments [Member] | Swiss Bank      
Segment Reporting Information      
Net revenues 3,515 4,228 4,457
Income/(loss) before taxes 180 1,579 1,981
Operating Segments [Member] | Asset Management      
Segment Reporting Information      
Net revenues 659 1,214 1,352
Income/(loss) before taxes (1,432) 202 372
Operating Segments [Member] | Non-core Legacy      
Segment Reporting Information      
Net revenues (1,185) 4,635 11,347
Income/(loss) before taxes (11,855) (5,323) (4,249)
Corporate Center      
Segment Reporting Information      
Net revenues 14,586 (61) (9)
Income/(loss) before taxes 14,075 (144) (218)
Adjustments      
Segment Reporting Information      
Net revenues (743) 293 346
Income/(loss) before taxes SFr (1,022) SFr (72) SFr 510