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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2025
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.
June 30, 2025December 31, 2024
(Dollars in Millions)
Level 1Level 2TotalLevel 1Level 2Total
Exchange-traded Funds
$5 $— $5 $2 $— $2 
Corporate Bonds— 75 75 — 71 71 
Government Securities— 53 53 — 42 42 
Asset-backed Securities
— 35 35 — 35 35 
Time Deposits— — — — 66 66 
Total Investments at Fair Value
$5 $163 $168 $2 $214 $216 
Schedule of Investment Maturities These investments have the following maturities:
(Dollars in Millions)
June 30,
2025		December 31,
2024
Less than 1 year
$6 $72 
1 - 5 years
86 72 
5 - 10 years
24 23 
Greater than 10 years
47 47 
Total Investments at Fair Value (a)
$163 $214 

(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)
June 30,
2025		December 31,
2024
Long-term Debt (Including Current Maturities):
Fair Value$17,426 $16,481 
Carrying Value19,166 18,503