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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 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, within the line items short-term investments and other long-term assets, as summarized in the following table.
March 31, 2026December 31, 2025
(Dollars in Millions)
Level 1Level 2TotalLevel 1Level 2Total
Exchange-traded Funds
$5 $— $5 $5 $— $5 
Time Deposits— 140 140 — — — 
Corporate Bonds— 69 69 — 82 82 
Government Securities— 69 69 — 71 71 
Asset-backed Securities
— 20 20 — 29 29 
Total Investments at Fair Value
$5 $298 $303 $5 $182 $187 
Schedule of Investment Maturities These investments have the following maturities:
(Dollars in Millions)
March 31,
2026		December 31,
2025
Less than 1 year
$145 $5 
1 - 5 years
81 94 
5 - 10 years
38 42 
Greater than 10 years
34 41 
Total Investments at Fair Value (a)
$298 $182 

(a) Exchange-traded funds are excluded as there is no stated contractual maturity date.
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)
March 31,
2026		December 31,
2025
Long-term Debt (Including Current Maturities):
Fair Value$17,022 $17,305 
Carrying Value18,868 18,873