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Pension Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,

 

 

Six Months Ended June 30,

 

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

 

 

(Dollars in Millions)

 

Service cost

 

$

10

 

 

$

9

 

 

$

19

 

 

$

16

 

Interest cost

 

 

15

 

 

 

15

 

 

 

28

 

 

 

26

 

Expected return on assets

 

 

(21

)

 

 

(20

)

 

 

(39

)

 

 

(36

)

Amortization of prior service cost

 

 

2

 

 

 

2

 

 

 

3

 

 

 

4

 

Net periodic benefit cost

 

$

6

 

 

$

6

 

 

$

11

 

 

$

10