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Pension and other post-retirement benefits - Obligation and funded status (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2024
Total amount recognized        
Noncurrent assets SFr 519 SFr 560    
Amounts recognized in AOCI        
Actuarial gains/(losses) (607) (582)    
Prior service credit/(cost) (8) (9)    
Total (615) (591)    
Amounts recognized in other comprehensive income        
Actuarial gains/(losses), Tax 30 84 SFr 0  
Actuarial gains/(losses), Net (37) (170)    
Prior service credit/(cost), Net   (4)    
Amortization of actuarial losses/ (gains), Net (2) 9    
Amortization of prior service cost/(credit), Net 1 1    
Immediate recognition due to curtailment/settlement, Net 14 8    
Total amounts recognized in other comprehensive income, Net (24) (156)    
Defined benefit and defined contribution        
Total benefit costs        
Service costs on benefit obligation 427 440 497  
PBO        
Service costs 427 440 497  
International | Defined benefit pension plans        
Total benefit costs        
Service costs on benefit obligation 12 14 14  
Interest costs on benefit obligation 86 58 49  
Expected return on plan assets (135) (67) (65)  
Amortization of recognized prior service cost/(credit) 1 1 1  
Amortization of recognized actuarial losses/(gains) (4) 9 14  
Settlement losses/(gains) 14 11 8  
Net periodic benefit/(costs) (26) 26 21  
PBO        
Beginning of the measurement period 1,897 3,022    
Service costs 12 14 14  
Interest costs 86 58 49  
Plan amendments 0 4    
Settlements (59) (37)    
Curtailments (1) 0    
Actuarial losses/(gains) 20 (908)    
Benefit payments (67) (71)    
Exchange rate losses/(gains) (120) (185)    
End of the measurement period 1,768 1,897 3,022  
Fair value of plan assets        
Beginning of the measurement period 2,316 3,802    
Actual return on plan assets 92 (1,132)    
Employer contributions 10 16    
Settlements (59) (37)    
Benefit payments (67) (71)    
Exchange rate gains/(losses) (126) (262)    
End of the measurement period 2,166 2,316 SFr 3,802  
Funded status recognized        
Funded status of the plan - overfunded/(underfunded) 398 419    
Total funded status recognized in the consolidated balance sheet at December 31 398 419    
Total amount recognized        
Noncurrent assets 520 559    
Current liabilities (11) (7)    
Noncurrent liabilities (111) (133)    
Total amount recognized in the consolidated balance sheet at December 31 398 419    
Defined Benefit Plan, Asset Portfolio Gains/(Losses) (43) (1,199)    
ABO        
End of the measurement period 1,758 1,880    
Amounts recognized in AOCI        
Actuarial gains/(losses) (599) (576)    
Prior service credit/(cost) (11) (12)    
Total (610) (588)    
Amounts recognized in other comprehensive income        
Actuarial gains/(losses), Gross (63) (284)    
Actuarial gains/(losses), Tax 28 94    
Actuarial gains/(losses), Net (35) (190)    
Prior service credit/(cost), Gross   (4)    
Prior service credit/(cost), Tax   0    
Prior service credit/(cost), Net   (4)    
Amortization of actuarial losses/(gains), Gross (4) 9    
Amortization of actuarial losses/(gains), Tax 2 (1)    
Amortization of actuarial losses/ (gains), Net (2) 8    
Amortization of prior service cost/(credit), Gross 1 1    
Amortization of prior service cost/(credit), Tax 0 0    
Amortization of prior service cost/(credit), Net 1 1    
Immediate recognition due to curtailment/settlement, Gross 14 11    
Immediate recognition due to curtailment/settlement, Tax 0 (3)    
Immediate recognition due to curtailment/settlement, Net 14 8    
Total amounts recognized in other comprehensive income, Gross (52) (267)    
Total amounts recognized in other comprehensive income, Tax 30 90    
Total amounts recognized in other comprehensive income, Net SFr (22) SFr (177)    
Net benefit pension cost (%)        
Discount rate - service costs (as a percent) 4.60% 2.90% 2.64%  
Discount rate - interest costs (as a percent) 5.03% 2.10% 1.56%  
Salary increases (as a percent) 3.20% 3.32% 2.97%  
Expected long-term rate of return on plan assets (as a percent) 4.35% 2.01% 1.79%  
Benefit obligation (%)        
Discount rate (as a percent) 4.69% 4.75% 2.13%  
Salary increases (as a percent) 3.25% 3.18% 3.32%  
International | Defined benefit pension plans | Forecast/Estimate        
Contributions disclosures        
Contribution to be made by the entity in next fiscal year       SFr 14
International | Other post-retirement defined benefit plans        
Total benefit costs        
Service costs on benefit obligation SFr 0 SFr 0 SFr 0  
Interest costs on benefit obligation 5 3 2  
Expected return on plan assets 0 0 0  
Amortization of recognized prior service cost/(credit) 0 0 0  
Amortization of recognized actuarial losses/(gains) 0 1 1  
Settlement losses/(gains) 0 0 0  
Net periodic benefit/(costs) 5 4 3  
PBO        
Beginning of the measurement period 107 140    
Service costs 0 0 0  
Interest costs 5 3 2  
Plan amendments 0 0    
Settlements 0 0    
Curtailments 0 0    
Actuarial losses/(gains) 2 (27)    
Benefit payments (12) (11)    
Exchange rate losses/(gains) (8) 2    
End of the measurement period 94 107 140  
Fair value of plan assets        
Beginning of the measurement period 0 0    
Actual return on plan assets 0 0    
Employer contributions 12 11    
Settlements 0 0    
Benefit payments (12) (11)    
Exchange rate gains/(losses) 0 0    
End of the measurement period 0 0 SFr 0  
Funded status recognized        
Funded status of the plan - overfunded/(underfunded) (94) (107)    
Total funded status recognized in the consolidated balance sheet at December 31 (94) (107)    
Total amount recognized        
Noncurrent assets 0 0    
Current liabilities (7) (10)    
Noncurrent liabilities (87) (97)    
Total amount recognized in the consolidated balance sheet at December 31 (94) (107)    
ABO        
End of the measurement period 94 107    
Amounts recognized in AOCI        
Actuarial gains/(losses) (8) (6)    
Prior service credit/(cost) 3 3    
Total (5) (3)    
Amounts recognized in other comprehensive income        
Actuarial gains/(losses), Gross (2) 27    
Actuarial gains/(losses), Tax 0 (7)    
Actuarial gains/(losses), Net (2) 20    
Prior service credit/(cost), Gross   0    
Prior service credit/(cost), Tax   0    
Prior service credit/(cost), Net   0    
Amortization of actuarial losses/(gains), Gross 0 1    
Amortization of actuarial losses/(gains), Tax 0 0    
Amortization of actuarial losses/ (gains), Net 0 1    
Amortization of prior service cost/(credit), Gross 0 0    
Amortization of prior service cost/(credit), Tax 0 0    
Amortization of prior service cost/(credit), Net 0 0    
Immediate recognition due to curtailment/settlement, Gross 0 0    
Immediate recognition due to curtailment/settlement, Tax 0 0    
Immediate recognition due to curtailment/settlement, Net 0 0    
Total amounts recognized in other comprehensive income, Gross (2) 28    
Total amounts recognized in other comprehensive income, Tax 0 (7)    
Total amounts recognized in other comprehensive income, Net SFr (2) SFr 21    
Net benefit pension cost (%)        
Discount rate - interest costs (as a percent) 5.02% 2.23% 1.74%  
Benefit obligation (%)        
Discount rate (as a percent) 4.83% 5.18% 2.89%  
Health care cost assumptions        
Weighted-average rate of health care benefit assumed (as a percent) [1] 8.30% 6.30% 6.50%  
Weighted-average rate of health care benefit decrease (as a percent) 4.50%      
International | Other post-retirement defined benefit plans | Forecast/Estimate        
Contributions disclosures        
Contribution to be made by the entity in next fiscal year       SFr 7
Health care cost assumptions        
Weighted-average rate of health care benefit assumed (as a percent)       8.30%
[1] The annual health care cost trend rate is assumed to decrease gradually to achieve the long-term health care cost trend rate of 4.5% by 2034.