(millions)

Pension Benefits

Other Postretirement Benefits

Three Months Ended March 31,

2023

2022

2023

2022

Service cost

$

2

$

2

$

—

$

—

Interest cost

8

5

2

2

Expected return on assets

(8

)

(12

)

—

—

Amortization of actuarial losses

3

—

(1

)

—

Net periodic benefit cost (credit)

$

5

$

(5

)

$

1

$

2