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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
PENSION AND OTHER POSTRETIREMENT BENEFITS

Net Periodic Benefit Cost for All Significant Plans
Three Months Ended
 
Nine Months Ended
In millions
Sep 30,
2012

 
Sep 30,
2011

 
Sep 30,
2012

 
Sep 30,
2011

Defined Benefit Pension Plans:
 
 
 
 
 
 
 
Service cost
$
7

 
$
6

 
$
21

 
$
18

Interest cost
47

 
50

 
141

 
150

Expected return on plan assets
(59
)
 
(64
)
 
(177
)
 
(190
)
Amortization of prior service cost
2

 
2

 
6

 
6

Amortization of net loss
15

 
21

 
45

 
63

Net periodic benefit cost
$
12

 
$
15

 
$
36

 
$
47

 
Other Postretirement Benefits:
 
 
 
 
 
 
 
Interest cost
$
4

 
$
5

 
$
12

 
$
15

Net periodic benefit cost
$
4

 
$
5

 
$
12

 
$
15