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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Investment Assets The Company's investment assets are summarized in the following table.
June 30, 2022December 31, 2021
(Dollars in Millions)Level 1Level 2TotalLevel 1Level 2Total
Fixed Income Mutual Funds$87 $— $87 $75 $— $75 
Corporate Bonds— 52 52 — 63 63 
Government Securities— 22 22 — 26 26 
Total investments at fair value$87 $74 $161 $75 $89 $164 
Total investments at amortized cost$163 $156 
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in millions)June 30,
2022		December 31,
2021
Less than 1 year
$88 $77 
1 - 5 years
25 28 
5 - 10 years
10 12 
Greater than 10 years
38 47 
Total investments at fair value
$161 $164 
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,
2022		December 31,
2021
Long-term Debt (Including Current Maturities):
Fair Value$15,302 $19,439 
Carrying Value16,210 16,366