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Pension Plans and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits, Description [Abstract]  
Components of Net Periodic Benefit Cost

The Company uses a December 31 measurement date for its defined benefit pension and other postretirement benefit plans. The following table sets forth the components of net periodic benefit costs for the three and nine months ended September 30 (dollars in millions):

 

 

Pension Benefits

 

 

Other Postretirement Benefits

 

 

 

2025

 

 

2024

 

 

2025

 

 

2024

 

Three months ended September 30:

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

4

 

 

$

4

 

 

$

1

 

 

$

1

 

Interest cost

 

 

8

 

 

 

8

 

 

 

2

 

 

 

2

 

Expected return on plan assets

 

 

(11

)

 

 

(11

)

 

 

(1

)

 

 

(1

)

Amortization of prior service cost (credit)

 

 

—

 

 

 

—

 

 

 

—

 

 

 

(1

)

Net loss recognition

 

 

1

 

 

 

1

 

 

 

—

 

 

 

—

 

Net periodic benefit cost

 

$

2

 

 

$

2

 

 

$

2

 

 

$

1

 

Nine months ended September 30:

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

12

 

 

$

12

 

 

$

2

 

 

$

2

 

Interest cost

 

 

26

 

 

 

25

 

 

 

5

 

 

 

5

 

Expected return on plan assets

 

 

(33

)

 

 

(34

)

 

 

(3

)

 

 

(3

)

Amortization of prior service cost (credit)

 

 

—

 

 

 

—

 

 

 

—

 

 

 

(1

)

Net loss recognition

 

 

2

 

 

 

2

 

 

 

—

 

 

 

1

 

Net periodic benefit cost

 

$

7

 

 

$

5

 

 

$

4

 

 

$

4