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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Investment Assets
(Dollars in Millions)
June 30,
2018
 
December 31,
2017
Certificates of Deposit and Commercial Paper
$
75

 
$
—

Corporate Bonds
57

 
61

Government Securities
39

 
34

Total investments at fair value
$
171

 
$
95
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in millions)
June 30,
2018
 
December 31,
2017
Less than 1 year
$
82

 
$
18

1 - 5 years
16

 
11

5 - 10 years
27

 
26

Greater than 10 years
46

 
40

Total investments at fair value
$
171

 
$
95
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,
2018
 
December 31,
2017
Long-term Debt (Including Current Maturities):
 
 
 
Fair Value
$
14,069

 
$
13,220

Carrying Value
13,788

 
11,809