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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
Financial Instruments [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value of Financial Instruments
Mar 31, 2018
Dec 31, 2017
In millions
Cost
Gain
Loss
Fair Value
Cost
Gain
Loss
Fair Value
Cash equivalents 1
$
9

$
—

$
—

$
9

$
9

$
—

$
—

$
9

Long-term debt including debt due within one year
$
(475
)
$
—

$
(111
)
$
(586
)
$
(475
)
$
—

$
(129
)
$
(604
)