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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost for All Significant Plans
Net Periodic Benefit Cost for All Significant Plans
Three Months Ended
 
Six Months Ended
In millions
Jun 30,
2016

 
Jun 30,
2015

 
Jun 30,
2016

 
Jun 30,
2015

Defined Benefit Pension Plans:
 
 
 
 
 
 
 
Service cost
$
9

 
$
11

 
$
18

 
$
22

Interest cost
33

 
41

 
66

 
82

Expected return on plan assets
(54
)
 
(57
)
 
(108
)
 
(114
)
Amortization of net loss
19

 
22

 
38

 
44

Net periodic benefit cost
$
7

 
$
17

 
$
14

 
$
34

 
 
 
 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
 
 
 
Interest cost
$
2

 
$
3

 
$
4

 
$
6

Amortization of net gain
(1
)
 
(3
)
 
(3
)
 
(6
)
Net periodic benefit cost
$
1

 
$
—

 
$
1

 
$
—