RETIREMENT PLANS (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [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
June 30,
 
Six Months Ended
June 30,
In millions
2015
 
2014
 
2015
 
2014
Service cost
$
41

 
$
35

 
$
80

 
$
73

Interest cost
150

 
147

 
299

 
300

Expected return on plan assets
(196
)
 
(192
)
 
(392
)
 
(381
)
Actuarial loss
96

 
106

 
215

 
186

Amortization of prior service cost
11

 
8

 
22

 
16

Net periodic pension expense
$
102

 
$
104

 
$
224

 
$
194