v3.25.4
Pensions and Other Postretirement Benefits - Contributions and Plan Amendments (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions to defined contribution plans   $ 915,000,000 $ 908,000,000 $ 742,000,000
U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Revised monthly basic benefit       5.00
Annual contribution       500
Increase in pension obligation       791,000,000
Payment for annuity purchase $ 699,000,000      
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Years of service   30 years    
Employer contributions   $ 201,000,000 1,179,000,000 753,000,000
Pension Plan | Non-U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   134,000,000 653,000,000 395,000,000
Estimated contributions in next fiscal year   390,000,000    
Pension Plan | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 67,000,000 $ 526,000,000 357,000,000
Expected rate on return of plan assets   6.00% 6.50%  
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 338,000,000 $ 338,000,000  
Other Postretirement Benefits Plan | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 286,000,000 $ 285,000,000 $ 295,000,000