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Capital adequacy (Details)
SFr in Millions
 12 Months Ended
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2021
CHF (SFr)
Swiss capital    
Swiss CET1 capital SFr 35,290 SFr 38,529
Going concern capital 50,026 54,372
Gone concern capital 49,117 46,648
Total loss-absorbing capacity (TLAC) 99,143 101,020
Swiss risk-weighted assets and leverage exposure    
Swiss risk-weighted assets 250,963 268,418
Leverage exposure SFr 650,551 SFr 889,137
Swiss capital ratios    
Swiss CET1 ratio 0.141 0.144
Going concern capital ratio 19.90% 20.30%
Gone concern capital ratio 19.60% 17.40%
TLAC ratio 0.395 0.376
Swiss leverage ratios    
Swiss CET1 leverage ratio 5.40% 4.30%
Going concern leverage ratio 7.70% 6.10%
Gone concern leverage ratio 7.60% 5.20%
TLAC leverage ratio 15.20% 11.40%
Capital ratio requirements %    
Swiss CET1 ratio requirement 9.28% 10.00%
Going concern capital ratio requirement 13.58% 14.30%
Gone concern capital ratio requirement 13.58% 14.30%
TLAC ratio requirement 0.2716 0.286
Leverage ratio requirements %    
Swiss CET1 leverage ratio requirement 3.25% 3.50%
Going concern leverage ratio requirement 4.75% 5.00%
Gone concern leverage ratio requirement 4.75% 5.00%
TLAC leverage ratio requirement 9.50% 10.00%
Description of Other Regulatory Limitations Certain of the Group’s subsidiaries are subject to legal restrictions governing the amount of dividends they can pay (for example, pursuant to corporate law as defined by the Swiss Code of Obligations).Under the Swiss Code of Obligations, dividends may be paid out only if and to the extent the corporation has distributable profits or distributable reserves. For holding companies, legal reserves may be distributed if they exceed, after deduction of any accumulated losses, treasury shares and reserves for own shares held by subsidiaries, 20% of the share capital registered in the commercial register. Furthermore, dividends may be paid out only after shareholder approval.  
Gone concern capital, phase-in   SFr 46,897
Instruments being phase-in   249
FINMA Pillar 2 capital add-on SFr 1,850  
Additional Swiss CET1 capital requirement 74  
Additional Swiss CET1 leverage requirement 28  
Bank    
Swiss capital    
Swiss CET1 capital SFr 40,987 44,185
Going concern capital 54,843 59,110
Gone concern capital 42,930 41,316
Total loss-absorbing capacity (TLAC) 97,773 100,426
Swiss risk-weighted assets and leverage exposure    
Swiss risk-weighted assets 249,953 267,558
Leverage exposure SFr 653,551 SFr 895,810
Swiss capital ratios    
Swiss CET1 ratio 0.164 0.165
Going concern capital ratio 21.90% 22.10%
Gone concern capital ratio 17.20% 15.40%
TLAC ratio 0.391 0.375
Swiss leverage ratios    
Swiss CET1 leverage ratio 6.30% 4.90%
Going concern leverage ratio 8.40% 6.60%
Gone concern leverage ratio 6.60% 4.60%
TLAC leverage ratio 15.00% 11.20%
Capital ratio requirements %    
Swiss CET1 ratio requirement 9.28% 10.00%
Going concern capital ratio requirement 13.58% 14.30%
Gone concern capital ratio requirement 13.58% 14.30%
TLAC ratio requirement 0.2716 0.286
Leverage ratio requirements %    
Swiss CET1 leverage ratio requirement 3.25% 3.50%
Going concern leverage ratio requirement 4.75% 5.00%
Gone concern leverage ratio requirement 4.75% 5.00%
TLAC leverage ratio requirement 9.50% 10.00%
Gone concern capital, phase-in   SFr 41,565
Instruments being phase-in   SFr 249
FINMA Pillar 2 capital add-on SFr 1,850  
Additional Swiss CET1 capital requirement 74  
Additional Swiss CET1 leverage requirement 28