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Earnings per share (Details) - CHF (SFr)
SFr / shares in Units, shares in Millions, SFr in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net income/(loss) attributable to shareholders          
Net income/(loss) attributable to shareholders SFr (1,593) SFr (273) SFr 253 SFr (1,866) SFr 1
Net income attributable to shareholders for basic earnings per share (1,593) (273) 253 (1,866) 1
Available for common shares (1,593) (273) 252 (1,866) 1
Available for mandatory convertible securities     1    
Net income/(loss) attributable to shareholders for diluted earnings per share (1,593) (273) 253 (1,866) 1
Available for common shares SFr (1,593) SFr (273) 252 SFr (1,866) SFr 1
Net Income (Loss) Available to Common Stockholders, Diluted, Available for mandatory convertible securities     SFr 1    
Weighted-average shares outstanding          
Weighted-average shares outstanding for basic earnings per share available for common shares (in shares) 2,646.5 2,617.9 2,453.9 2,632.2 2,450.3
Dilutive share options and warrants (in shares) 0.0 0.0 0.8 0.0 0.6
Dilutive share awards (in shares) 0.0 0.0 55.1 0.0 73.6
Weighted-average shares outstanding for diluted earnings per share available for common shares (in shares) 2,646.5 2,617.9 2,509.8 2,632.2 2,524.5
Weighted-average shares outstanding for basic/diluted earnings per share available for mandatory convertible securities     130.8   65.4
Basic earnings per share available for common shares (CHF)          
Basic earnings/(loss) per share (in CHF per share) SFr (0.60) SFr (0.10) SFr 0.10 SFr (0.71) SFr 0.00
Diluted earnings per share available for common shares (CHF)          
Diluted earnings/(loss) per share (in CHF per share) SFr (0.60) SFr (0.10) SFr 0.10 SFr (0.71) SFr 0.00
Weighted-average potential dilutive common shares 12.4 14.5 9.6 13.4 8.1
Weighted-average share options and warrants (antidilutive) 2.8 0.8   1.8  
Weighted-average share awards (antidilutive) 32.5 64.8   48.7