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Pension and Other Benefit Programs - Fair Value Of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements $ 709 $ 744
Funded status 55 50
Post-retirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (116) (129)
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 161 162
Significant Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 542 577
Significant Unobservable Inputs  (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 6 5
Cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 8 8
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 8 8
Cash | Significant Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
Cash | Significant Unobservable Inputs  (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
U.S. large-cap    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 20 18
U.S. large-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
U.S. large-cap | Significant Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 20 18
U.S. large-cap | Significant Unobservable Inputs  (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
U.S. small-cap    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 5 6
U.S. small-cap | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
U.S. small-cap | Significant Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 5 6
U.S. small-cap | Significant Unobservable Inputs  (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
International    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 10 11
International | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
International | Significant Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 10 11
International | Significant Unobservable Inputs  (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 0 0
Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 666 701
Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 153 154
Fixed income securities | Significant Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements 507 542
Fixed income securities | Significant Unobservable Inputs  (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value Measurements $ 6 $ 5