v3.26.1
Employee Benefit Plans - MEC (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Plan | United States    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 3 $ 3
Interest cost 25 26
Expected return on plan assets (31) (30)
Net periodic benefit (credit) cost (1) 1
Pension Plan | United States | MEC    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2 2
Interest cost 7 8
Expected return on plan assets (8) (8)
Net periodic benefit (credit) cost 1 2
Other Postretirement Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 7 7
Expected return on plan assets (10) (9)
Net periodic benefit (credit) cost (3) (2)
Other Postretirement Plans | MEC    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 3 3
Expected return on plan assets (5) (5)
Net periodic benefit (credit) cost $ (1) $ (1)