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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
PENSION AND OTHER POSTRETIREMENT BENEFITS
Net Periodic Benefit Cost for All Significant Plans
Three Months Ended
 
Six Months Ended
In millions
Jun 30,
2017

 
Jun 30,
2016

 
Jun 30,
2017

 
Jun 30,
2016

Defined Benefit Pension Plans:
 
 
 
 
 
 
 
Service cost
$
9

 
$
9

 
$
18

 
$
18

Interest cost
32

 
33

 
64

 
66

Expected return on plan assets
(55
)
 
(54
)
 
(110
)
 
(108
)
Amortization of net loss
21

 
19

 
42

 
38

Net periodic benefit cost
$
7

 
$
7

 
$
14

 
$
14

 
 
 
 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
 
 
 
Interest cost
$
2

 
$
2

 
$
4

 
$
4

Amortization of net gain
(1
)
 
(1
)
 
(2
)
 
(3
)
Net periodic benefit cost
$
1

 
$
1

 
$
2

 
$
1