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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
Net Periodic Benefit Cost for All Significant Plans
Three Months Ended
Nine Months Ended
In millions
Sep 30,
2017
Sep 30,
2016
Sep 30,
2017
Sep 30,
2016
Defined Benefit Pension Plans:
 
 
 
 
Service cost
$
10

$
9

$
28

$
27

Interest cost
33

33

97

99

Expected return on plan assets
(56
)
(54
)
(166
)
(162
)
Amortization of net loss
20

19

62

57

Net periodic benefit cost
$
7

$
7

$
21

$
21

 
 
 
 
 
Other Postretirement Benefits:
 
 
 
 
Interest cost
$
2

$
2

$
6

$
6

Amortization of net gain
(2
)
(2
)
(4
)
(5
)
Net periodic benefit cost
$
—

$
—

$
2

$
1