Pension Benefits

Other Postretirement Benefits

Quarter-to-Date

Year-to-Date

Quarter-to-Date

Year-to-Date

Period Ended June 30,

(millions)

Service cost

$

24

$

35

$

48

$

71

$

4

$

5

$

7

$

11

Interest cost

Expected return on plan assets

(216

)

(223

)

(432

)

(446

)

(38

)

(48

)

(76

)

(96

)

Amortization of prior service 
   cost (credit)

—

—

—

—

(9

)

(9

)

(18

)

(19

)

Amortization of net actuarial 
   (gain) loss

—

40

—

80

(2

)

(1

)

(3

)

(1

)

Net periodic benefit 
   (credit) cost

$

(82

)

$

(64

)

$

(163

)

$

(128

)

$

(29

)

$

(41

)

$

(59

)

$

(82

)