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Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation Including Fair-Value Measurements (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets $ 654 $ 565  
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 7 4  
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 87 95  
Government debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 69 59  
Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 123 120  
Investment in funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 100 87  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 9 6  
Other (mainly insurance assets – contracts and reserves)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 259 194  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 22 6  
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 7 4  
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 1 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 in funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 14 1  
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 399 381  
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 86 94  
Significant Other Observable Inputs (Level 2) | Government debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 69 59  
Significant Other Observable Inputs (Level 2) | Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 101 98  
Significant Other Observable Inputs (Level 2) | Investment in funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 86 86  
Significant Other Observable Inputs (Level 2) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 9 6  
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 48 38  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 233 178 $ 167
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 0 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 22 22  
Significant Unobservable Inputs (Level 3) | Investment in funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, fair value of plan assets 0 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 $ 211 $ 156