v3.25.4
Pension and Postretirement Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 01, 2025
Defined Benefit Plan Disclosure [Line Items]        
Net actuarial gain (loss) arising during the period $ 25 $ (23) $ (11)  
Retail Marketing Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail Marketing Business        
Defined Benefit Plan Disclosure [Line Items]        
Ownership percentage, divested       65.00%
Pension Benefits | United States        
Defined Benefit Plan Disclosure [Line Items]        
Unrecognized net actuarial loss (gain) 102 141    
Net actuarial gain (loss) arising during the period 14 (49)    
Divestiture 0 0    
Amortization of net actuarial loss (gain) and settlements 25 19    
Total recognized in other comprehensive income 39 (30)    
Pension Benefits | Int’l.        
Defined Benefit Plan Disclosure [Line Items]        
Unrecognized net actuarial loss (gain) (15) (16)    
Net actuarial gain (loss) arising during the period 12 18    
Divestiture (12) 0    
Amortization of net actuarial loss (gain) and settlements (1) 0    
Total recognized in other comprehensive income (1) 18    
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Unrecognized net actuarial loss (gain) (48) (54)    
Net actuarial gain (loss) arising during the period (1) 8    
Divestiture 0 0    
Amortization of net actuarial loss (gain) and settlements (5) (5)    
Total recognized in other comprehensive income $ (6) $ 3