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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Investment Assets The Company's investment assets are summarized in the following table.
(Dollars in Millions)September 30,
2021		December 31,
2020
Corporate Bonds$65 $68 
Government Securities28 33 
Total investments at fair value$93 $101 
Total investments at amortized cost$84 $89 
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in millions)September 30,
2021		December 31,
2020
Less than 1 year
$3 $2 
1 - 5 years
28 22 
5 - 10 years
14 23 
Greater than 10 years
48 54 
Total investments at fair value
$93 $101 
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,
2021		December 31,
2020
Long-term Debt (Including Current Maturities):
Fair Value$19,654 $21,076 
Carrying Value16,393 16,705