Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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)	March 31, 2020		December 31, 2019
Commercial Paper and Certificates of Deposit	$	486	$	989
Corporate Bonds	56		59
Government Securities	37		36
Total investments at fair value	$	579	$	1,084
Total investments at amortized cost	$	573	$	1,076

Schedule of Investment Maturities

These investments have the following maturities:

(Dollars in millions)	March 31, 2020		December 31, 2019
Less than 1 year	$	487	$	996
1 - 5 years	9		10
5 - 10 years	31		25
Greater than 10 years	52		53
Total investments at fair value	$	579	$	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)	March 31, 2020		December 31, 2019
Long-term Debt (Including Current Maturities):
Fair Value	$	18,778	$	18,503
Carrying Value	16,732		16,238