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Pension Benefits (Tables)
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost

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

 

 

 

Pension

 

 

 

Three Months Ended March 31,

 

 

 

2024

 

 

2023

 

 

 

(Dollars in Millions)

 

Service cost

 

$

9

 

 

$

8

 

Interest cost

 

 

14

 

 

 

13

 

Expected return on assets

 

 

(20

)

 

 

(18

)

Amortization of prior service cost

 

 

2

 

 

 

1

 

Net periodic benefit cost

 

$

5

 

 

$

4