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FINANCIAL INSTRUMENTS
 9 Months Ended
Sep. 30, 2017
Financial Instruments [Abstract]  
Financial Instruments Disclosure [Text Block]
FINANCIAL INSTRUMENTS
Investments
The Corporation's investments in marketable securities are classified as available-for-sale. Proceeds from sales of available-for-sale securities were $2 million for the nine-month period ended September 30, 2017 ($2 million in proceeds from the maturity of marketable securities for the nine-month period ended September 30, 2016).

For securities frequently traded in less active markets, fair value is based on the closing price at the end of the period; where the security is less frequently traded, fair value is based on the price a dealer would pay for the security or similar securities, adjusted for any terms specific to that asset or liability, or by using observable market data points of similar, more liquid securities to imply the price. Market inputs are obtained from well-established and recognized vendors of market data and subjected to tolerance/quality checks.

Fair Value of Financial Instruments
Sep 30, 2017
Dec 31, 2016
In millions
Cost
Gain
Loss
Fair Value
Cost
Gain
Loss
Fair Value
Cash equivalents
$
9

$
—

$
—

$
9

$
7

$
—

$
—

$
7

Debt securities 1
$
—

$
—

$
—

$
—

$
2

$
—

$
—

$
2

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

$
(134
)
$
(609
)
$
(476
)
$
—

$
(95
)
$
(571
)
1. Marketable securities are included in "Other investments" in the consolidated balance sheets.

For all other financial instruments, cost approximates fair value.