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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Sep. 30, 2019
Financial Instruments [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table summarizes the fair value of the Corporation's financial instruments at September 30, 2019 and December 31, 2018:

Fair Value of Financial Instruments
Sep 30, 2019
Dec 31, 2018
In millions
Cost
Gain
Loss
Fair Value
Cost
Gain
Loss
Fair Value
Cash equivalents 1
$
10

$
—

$
—

$
10

$
10

$
—

$
—

$
10

Long-term debt including debt due within one year
$
(474
)
$
—

$
(115
)
$
(589
)
$
(474
)
$
—

$
(67
)
$
(541
)

1. Money market fund is included in "Cash and cash equivalents" in the consolidated balance sheets and held at amortized cost, which approximates fair value.