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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost for All Significant Plans
Net Periodic Benefit Cost (Credit) for All Significant Plans
Three Months Ended
Nine Months Ended
In millions
Sep 30,
2018
Sep 30,
2017
Sep 30,
2018
Sep 30,
2017
Defined Benefit Pension Plans:
 
 
 
 
Service cost
$
10

$
10

$
30

$
28

Interest cost
32

33

96

97

Expected return on plan assets
(55
)
(56
)
(164
)
(166
)
Amortization of net loss
24

20

71

62

Net periodic benefit cost
$
11

$
7

$
33

$
21

 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
Interest cost
$
2

$
2

$
5

$
6

Amortization of net gain
(3
)
(2
)
(7
)
(4
)
Net periodic benefit cost (credit)
$
(1
)
$
—

$
(2
)
$
2