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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [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,
2019
Jun 30,
2018
Jun 30,
2019
Jun 30,
2018
Defined Benefit Pension Plans:
 
 
 
 
Service cost
$
9

$
10

$
18

$
20

Interest cost
36

32

72

64

Expected return on plan assets
(53
)
(54
)
(106
)
(109
)
Amortization of net loss
21

23

42

47

Net periodic benefit cost
$
13

$
11

$
26

$
22

 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
Interest cost
$
2

$
1

$
4

$
3

Amortization of net gain
(2
)
(2
)
(4
)
(4
)
Net periodic benefit cost
$
—

$
(1
)
$
—

$
(1
)