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Fair Value Measures and Disclosures (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table summarizes the fair value of the Corporation's financial instruments at March 31, 2021 and December 31, 2020:


Fair Value of Financial Instruments	Mar 31, 2021								Dec 31, 2020
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	$	(393)	$	—	$	(114)	$	(507)	$	(393)	$	—	$	(120)	$	(513)

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.