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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Investment Assets
(Dollars in Millions)
September 30,
2018
 
December 31,
2017
Certificates of Deposit and Commercial Paper
$
610

 
$
—

Corporate Bonds
56

 
61

Government Securities
40

 
34

Total investments at fair value
$
706

 
$
95
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in millions)
September 30,
2018
 
December 31,
2017
Less than 1 year
$
615

 
$
18

1 - 5 years
17

 
11

5 - 10 years
25

 
26

Greater than 10 years
49

 
40

Total investments at fair value
$
706

 
$
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)
September 30,
2018
 
December 31,
2017
Long-term Debt (Including Current Maturities):
 
 
 
Fair Value
$
14,173

 
$
13,220

Carrying Value
13,772

 
11,809