v3.25.3
Fair Value Measures and Disclosures (Tables)
9 Months Ended
Sep. 30, 2025
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, 2025 and December 31, 2024:

Fair Value of Financial InstrumentsSep 30, 2025Dec 31, 2024
In millionsCostGainLossFair ValueCostGainLossFair Value
Cash equivalents 1
$11 $— $— $11 $11 $— $— $11 
Long-term debt including debt due within one year$(143)$— $(21)$(164)$(269)$— $(26)$(295)
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.