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Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2011
Postretirement Benefits  
Components of net periodic benefit cost for pension benefits

 

 

(in millions)

 

Three months ended
June 30,

 

Six months ended
June 30,

 

 

 

2011

 

2010

 

2011

 

2010

 

Service cost

 

$ 5

 

$ 4

 

$  9

 

$  8

 

Interest cost

 

5

 

5

 

11

 

10

 

Expected return on plan assets

 

(6)

 

(7)

 

(13)

 

(13)

 

Amortization of prior service cost

 

0

 

0

 

0

 

0

 

Amortization of actuarial loss

 

1

 

1

 

3

 

2

 

Net periodic benefit cost

 

$ 5

 

$ 3

 

$  10

 

$  7