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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2021
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. All of the inputs used to determine the fair value of the Company's investments are Level 2 inputs.
(Dollars in Millions)March 31,
2021		December 31,
2020
Corporate Bonds$65 $68 
Government Securities30 33 
Total investments at fair value$95 $101 
Total investments at amortized cost$87 $89 
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in millions)March 31,
2021		December 31,
2020
Less than 1 year
$2 $2 
1 - 5 years
23 22 
5 - 10 years
20 23 
Greater than 10 years
50 54 
Total investments at fair value
$95 $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)March 31,
2021		December 31,
2020
Long-term Debt (Including Current Maturities):
Fair Value$18,765 $21,076 
Carrying Value16,347 16,705