v3.25.4
Postemployment benefit plans (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Defined Benefit Plan Disclosure    
Liability for postemployment benefits $ 3,838 $ 3,757
ESOP, number of allocated shares 9.6 10.4
Insurance contracts | Level 3 | Non-U.S.  Pension Benefits    
Defined Benefit Plan Disclosure    
Settlements $ 58 $ 59
Unrealized gains (loss) 34 (15)
Other Postretirement  Benefits    
Defined Benefit Plan Disclosure    
Liability for postemployment benefits $ 861 $ 697
Assumed increase in health care trend rate over the current period to calculate benefit expenses (as a percent)   6.00%
Assumed increase in health care trend rate for the next year to calculate benefit expenses (as a percent) 6.70%  
Ultimate health care cost trend rate (as a percent) 4.70%  
Year that heath care trend rate is assumed to reach ultimate trend rate (year) 2037  
Other Postretirement  Benefits | Debt Security    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 60.00%  
Other Postretirement  Benefits | Equity Securities    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 40.00%  
Pension Plan | Debt Security | U.S. Pension Benefits    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 87.00%  
Pension Plan | Debt Security | Non-U.S.  Pension Benefits    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 59.00%  
Pension Plan | Equity Securities | U.S. Pension Benefits    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 13.00%  
Pension Plan | Equity Securities | Non-U.S.  Pension Benefits    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 11.00%  
Pension Plan | Insurance contracts | Non-U.S.  Pension Benefits    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 18.00%  
Pension Plan | Real estate | Non-U.S.  Pension Benefits    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 7.00%  
Pension Plan | Other plan assets | Non-U.S.  Pension Benefits    
Defined Benefit Plan Disclosure    
Target allocation of plan assets (as a percent) 5.00%  
U.S. benefits    
Defined Benefit Plan Disclosure    
Percentage that the employer generally matches of employee contributions to U.S. defined contribution plans 100.00%  
Employee compensation percentage contributed to defined contribution plan eligible for employer matching contributions 6.00%  
New annual employer contribution, percentage of compensation, low end of range 3.00%  
New annual employer contribution, percentage of compensation, high end of range 5.00%