Fair Value Measures and Disclosures (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [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, 2023 and December 31, 2022:

Fair Value of Financial Instruments	Sep 30, 2023								Dec 31, 2022
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	$	(263)	$	—	$	(20)	$	(283)	$	(394)	$	—	$	(29)	$	(423)

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.