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Share-based compensation - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2024
€ / shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2023
€ / shares
Share option          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, options, grants in period, gross | shares 0 0   0  
2025 Equity Incentive Plan (EIP) | Performance shares          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Percentage of shares reserved for sale 10.00%        
Vesting period 3 years        
Weighted average grant date fair value (in usd per share) | $ / shares $ 103.13        
Awards vested (in shares) | shares 0        
Unrecognized compensation expense | $ $ 74        
Unrecognized compensation expense, remaining weighted average vesting period 2 years 3 months        
2025 Equity Incentive Plan (EIP) | Performance shares | Minimum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage 0.00%        
2025 Equity Incentive Plan (EIP) | Performance shares | Maximum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage 200.00%        
2025 Equity Incentive Plan (EIP) | Performance shares | Total shareholder return metric          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Performance conditions, percentage 25.00%        
2025 Equity Incentive Plan (EIP) | Performance shares | Return on net assets metric          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Performance conditions, percentage 25.00%        
2025 Equity Incentive Plan (EIP) | Performance shares | Cumulative cash flow metric          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Performance conditions, percentage 50.00%        
2025 Equity Incentive Plan (EIP) | Restricted Stock Units (RSUs)          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Percentage of shares reserved for sale 10.00%        
Weighted average grant date fair value (in usd per share) | $ / shares $ 98.20        
Awards vested (in shares) | shares 0        
Unrecognized compensation expense | $ $ 54        
Unrecognized compensation expense, remaining weighted average vesting period 2 years 3 months 18 days        
2014 Performance Share Plan (PSP)          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Percentage of shares reserved for sale 10.00% 10.00%   10.00%  
2014 Performance Share Plan (PSP) | Performance shares          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting period   3 years      
Weighted average grant date fair value (in usd per share) | (per share)   $ 79.52 € 73.85 $ 48.55 € 45.57
Awards vested (in shares) | shares 3,102,394 3,080,029   2,985,299  
Fair value of awards vested | $ $ 316 $ 256   $ 147  
Unrecognized compensation expense | $ $ 78        
Unrecognized compensation expense, remaining weighted average vesting period 8 months 26 days        
2014 Performance Share Plan (PSP) | Performance shares | Total shareholder return metric          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Performance conditions, percentage   20.00%   20.00%  
2014 Performance Share Plan (PSP) | Performance shares | Return on net assets metric          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Performance conditions, percentage   20.00%   20.00%  
2014 Performance Share Plan (PSP) | Performance shares | Sustainability and diversity metric          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Performance conditions, percentage   15.00%   15.00%  
2014 Performance Share Plan (PSP) | Performance shares | Cumulative cash flow metric          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Performance conditions, percentage   45.00%   45.00%