v3.26.1
Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Schedule of Carrying Amounts and Estimated Fair Values
The following table presents the carrying amounts and estimated fair values of our financial liabilities, as well as the input level used to determine the fair values indicated below:

  March 31, 2026December 31, 2025
 
Input Level
Carrying
Amount
Fair Value
Carrying
Amount
Fair Value
  (Dollars in millions)
Long-term debt (excluding finance leases)
2$1,686 1,281 1,686 1,261 
Regulatory cost liability related to the sale of the Mass Markets Fiber-to-the-Home business(1)
318 18 — — 
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(1)Nonrecurring fair value is measured as of February 2, 2026.