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RETIREMENT PLANS (Tables)
9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Net Periodic Pension Expense for Qualified and Nonqualified U.S. Defined Benefit Plans [Table Text Block]
Net periodic pension expense for our qualified and nonqualified U.S. defined benefit plans comprised the following: 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
In millions
2018
 
2017
 
2018
 
2017
Service cost
$
40

 
$
39

 
$
119

 
$
118

Interest cost
118

 
138

 
356

 
415

Expected return on plan assets
(200
)
 
(192
)
 
(600
)
 
(577
)
Actuarial loss
95

 
87

 
285

 
260

Amortization of prior service cost
4

 
7

 
12

 
21

Net periodic pension expense
$
57

 
$
79

 
$
172

 
$
237