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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2020
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)June 30,
2020		December 31,
2019
Commercial Paper and Certificates of Deposit $202  $989  
Corporate Bonds67  59  
Government Securities35  36  
Total investments at fair value$304  $1,084  
Total investments at amortized cost$294  $1,076  
Schedule of Investment Maturities These investments have the following maturities:
(Dollars in millions)June 30,
2020		December 31,
2019
Less than 1 year
$203  $996  
1 - 5 years
11  10  
5 - 10 years
37  25  
Greater than 10 years
53  53  
Total investments at fair value
$304  $1,084  
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,
2020		December 31,
2019
Long-term Debt (Including Current Maturities):
Fair Value$20,733  $18,503  
Carrying Value16,506  16,238