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Pension Benefits (Tables)
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost

The net periodic benefit cost for pension benefits includes the following components:

 

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

 

 

(Dollars in Millions)

 

Service cost

 

$

10

 

 

$

8

 

 

$

29

 

 

$

25

 

Interest cost

 

 

14

 

 

 

13

 

 

 

41

 

 

 

39

 

Expected return on assets

 

 

(20

)

 

 

(18

)

 

 

(59

)

 

 

(54

)

Amortization of:

 

 

 

 

 

 

 

 

 

 

 

 

Prior service cost

 

 

2

 

 

 

2

 

 

 

5

 

 

 

4

 

Actuarial loss

 

 

—

 

 

 

—

 

 

 

1

 

 

 

—

 

Net periodic benefit cost

 

$

6

 

 

$

5

 

 

$

17

 

 

$

14