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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2026
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Investment Assets
The Company's investment assets are carried at fair value on the consolidated balance sheets and are included in short-term investments and other long-term assets. Investment asset holdings are summarized in the following table.
September 30, 2026December 31, 2025
(Dollars in Millions)
Level 1Level 2TotalLevel 1Level 2Total
Exchange-traded Funds
$6 $— $6 $5 $— $5 
Time Deposits— 375 375 — — — 
Government Securities— 69 69 — 71 71 
Corporate Bonds— 67 67 — 82 82 
Asset-backed Securities
— 17 17 — 29 29 
Total Investments at Fair Value
$6 $528 $534 $5 $182 $187 
Schedule of Investment Maturities All investment assets other than exchange-traded funds have stated contractual maturity dates as summarized in the following table:
(Dollars in Millions)
September 30,
2026		December 31,
2025
Less than 1 year
$382 $5 
1 - 5 years
85 94 
5 - 10 years
31 42 
Greater than 10 years
30 41 
Total Investments at Fair Value$528 $182 
Schedule of Fair Value and Carrying Value of Long-Term Debt
The fair value and carrying value of the Company's long-term debt is as follows:
(Dollars in Millions)
September 30,
2026		December 31,
2025
Long-term Debt (Including Current Maturities):
Fair Value$15,921 $17,305 
Carrying Value18,804 18,873