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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 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)September 30,
2020		December 31,
2019
Commercial Paper and Certificates of Deposit $— $989 
Corporate Bonds68 59 
Government Securities34 36 
Total investments at fair value$102 $1,084 
Total investments at amortized cost$91 $1,076 
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in millions)September 30,
2020		December 31,
2019
Less than 1 year
$1 $996 
1 - 5 years
18 10 
5 - 10 years
30 25 
Greater than 10 years
53 53 
Total investments at fair value
$102 $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)September 30,
2020		December 31,
2019
Long-term Debt (Including Current Maturities):
Fair Value$20,457 $18,503 
Carrying Value16,492 16,238