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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2024
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 as summarized in the following table.
June 30, 2024December 31, 2023
(Dollars in Millions)
Level 1Level 2TotalLevel 1Level 2Total
Fixed Income Mutual Funds$— $— $— $80 $— $80 
Corporate Bonds— 81 81 — 60 60 
Government Securities— 48 48 — 41 41 
Total Investments at Fair Value$— $129 $129 $80 $101 $181 
Total Investments at Amortized Cost$133 $184 
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in Millions)
June 30,
2024		December 31,
2023
Less than 1 year
$4 $83 
1 - 5 years
62 37 
5 - 10 years
17 17 
Greater than 10 years
46 44 
Total Investments at Fair Value$129 $181 
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,
2024		December 31,
2023
Long-term Debt (Including Current Maturities):
Fair Value$16,576 $17,528 
Carrying Value18,508 18,533