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Employee Benefits - Schedule of Net Periodic Benefit Cost Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Current year actuarial (gain) loss $ 0 $ (1) $ 3
Amortization of actuarial loss (1) 0 (4)
Pension Benefits      
Components of net periodic pension benefit cost (credit):      
Service cost 15 17 17
Interest cost 87 83 85
Expected return on plan assets (90) (94) (94)
Amortization of prior service (credit) cost (3) (3) (3)
Amortization of actuarial loss 21 22 13
Settlements 0 1 1
Net periodic pension benefit cost (credit) 30 26 19
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Current year actuarial (gain) loss 0 (1) 3
Amortization of actuarial loss (1) 0 (4)
Total recognized in other comprehensive income (1) (1) (1)
Total recognized in net periodic benefit cost (credit) and other comprehensive income 29 25 18
Other Benefits      
Components of net periodic pension benefit cost (credit):      
Service cost 2 2 2
Interest cost 12 12 14
Expected return on plan assets (12) (12) (12)
Amortization of prior service (credit) cost (31) (31) (31)
Amortization of actuarial loss 0 0 2
Net periodic pension benefit cost (credit) $ (29) $ (29) $ (25)