v3.26.1
Employee Benefits - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Employee Benefits    
Recognition of prior service costs (credits) $ (6)  
Combined Pension Plan    
Employee Benefits    
Settlement charges 9 $ 0
Curtailment gain (loss) 5 0
Service cost 4 5
Contributions 101  
Post-Retirement Benefit Plan    
Employee Benefits    
Curtailment gain (loss) (10) 0
Recognition of prior service costs (credits) (1) (2)
Service cost $ 1 $ 1