v3.25.4
Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation Including Fair-Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets $ 717 $ 646  
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 17 7  
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 185 91  
Government debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 80 63  
Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 95 94  
Investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 65 106  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 62 10  
Other (mainly insurance assets – contracts and reserves)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets $ 213 275  
Defined benefit plan members covered, percentage 100.00%    
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets $ 106 24  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 17 7  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 72 1  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 17 16  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other (mainly insurance assets – contracts and reserves)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 337 390  
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 97 90  
Significant Other Observable Inputs (Level 2) | Government debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 80 63  
Significant Other Observable Inputs (Level 2) | Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 95 77  
Significant Other Observable Inputs (Level 2) | Investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 47 90  
Significant Other Observable Inputs (Level 2) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 8 10  
Significant Other Observable Inputs (Level 2) | Other (mainly insurance assets – contracts and reserves)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 10 60  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 274 232 $ 233
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 16 0  
Significant Unobservable Inputs (Level 3) | Government debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 17  
Significant Unobservable Inputs (Level 3) | Investment funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 1 0  
Significant Unobservable Inputs (Level 3) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 54 0  
Significant Unobservable Inputs (Level 3) | Other (mainly insurance assets – contracts and reserves)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets $ 203 $ 215