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Pension and Postretirement Benefits (Unaudited)
9 Months Ended
Sep. 30, 2011
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] 
Pension and Postretirement Benefits
PENSION AND POSTRETIREMENT BENEFITS
The components of net periodic benefit costs for pension and postretirement benefits follow (in millions):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2011
 
2010
 
2011
 
2010
Service cost
$
9

 
$
8

 
$
29

 
$
26

Interest cost
27

 
27

 
81

 
80

Expected return on plan assets
(24
)
 
(23
)
 
(72
)
 
(70
)
Amortization of net actuarial loss
6

 
6

 
18

 
17

Net periodic benefit costs
$
18

 
$
18

 
$
56

 
$
53