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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Investment Assets
(Dollars in Millions)
March 31,
2018
 
December 31,
2017
 
Level 2
 
Level 2
Certificates of Deposit and Commercial Paper
$
—

 
$
—

Corporate Bonds
58

 
61

Government Securities
36

 
34

Auction Rate Securities
—

 
—

Total investments at fair value
$
94

 
$
95
Schedule of Investment Maturities
These investments have the following maturities:
(Dollars in millions)
March 31,
2018
 
December 31,
2017
Less than 1 year
$
10

 
$
18

1 - 5 years
17

 
11

5 - 10 years
25

 
26

Greater than 10 years
42

 
40

Total investments at fair value
$
94

 
$
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)
March 31,
2018
 
December 31, 2017
Long-term Debt (Including Current Maturities):
 
 
 
Fair Value
$
14,487

 
$
13,220

Carrying Value
13,787

 
11,809