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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
 9 Months Ended
Sep. 30, 2015
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,
2015

 
Sep 30,
2014

 
Sep 30,
2015

 
Sep 30,
2014

Defined Benefit Pension Plans:
 
 
 
 
 
 
 
Service cost
$
11

 
$
7

 
$
33

 
$
23

Interest cost
41

 
46

 
123

 
138

Expected return on plan assets
(57
)
 
(58
)
 
(171
)
 
(174
)
Amortization of prior service cost
—

 
1

 
—

 
3

Amortization of net loss
22

 
17

 
66

 
51

Net periodic benefit cost
$
17

 
$
13

 
$
51

 
$
41

 
 
 
 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
 
 
 
Interest cost
$
3

 
$
3

 
$
9

 
$
9

Amortization of net gain
(3
)
 
(2
)
 
(9
)
 
(6
)
Net periodic benefit cost
$
—

 
$
1

 
$
—

 
$
3