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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table summarizes the fair value of the Corporation's financial instruments at December 31, 2018 and 2017:

Fair Value of Financial Instruments
2018
2017
In millions
Cost
Gain
Loss
Fair Value
Cost
Gain
Loss
Fair Value
Cash equivalents 1
$
10

$
—

$
—

$
10

$
9

$
—

$
—

$
9

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

$
(67
)
$
(541
)
$
(475
)
$
—

$
(129
)
$
(604
)

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.