v3.26.1
Employee Benefit Plans - MEC (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Plan | United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3 $ 3 $ 6 $ 6
Interest cost 25 28 50 54
Expected return on plan assets (29) (31) (60) (61)
Net amortization 3 2 5 4
Net periodic benefit cost 2 2 1 3
Pension Plan | United States | MEC        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2 2 4 4
Interest cost 8 8 15 16
Expected return on plan assets (8) (8) (16) (16)
Settlement 0 0 0 0
Net amortization 0 0 0 0
Net periodic benefit cost 2 2 3 4
Other Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 6 7 13 14
Expected return on plan assets (8) (9) (18) (18)
Net amortization (1) (2) (2) (3)
Net periodic benefit cost (2) (3) (5) (5)
Other Postretirement Plans | MEC        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 3 3 6 6
Expected return on plan assets (5) (4) (10) (9)
Net amortization (1) (1) (1) (1)
Net periodic benefit cost $ (2) $ (1) $ (3) $ (2)