(millions)

Pension Benefits

Other Postretirement Benefits

Three Months Ended June 30,

2025

2024

2025

2024

Service cost

$

2

$

2

$

—

$

1

Interest cost

8

8

2

2

Expected return on assets

(11

)

(10

)

—

—

Amortization of actuarial losses

2

2

(1

)

(1

)

Net periodic benefit cost

$

1

$

2

$

1

$

2

Six Months Ended June 30,

Service cost

$

4

$

4

$

—

$

1

Interest cost

17

16

4

4

Expected return on assets

(21

)

(19

)

—

—

Amortization of actuarial losses

3

4

(2

)

(2

)

Net periodic benefit cost

$

3

$

5

$

2

$

3