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Debt and Credit Agreements (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Activity Related to Long-Term Debt
Total activity related to long-term debt as of the end of second quarter 2018 is shown in the table below. For fair value information related to the Company's long-term debt, see Note 9, Fair Value Measurements.

(Dollars in millions)
Current Portion
Long-term Portion
Total
Long-term debt as of December 31, 2017
$
19

$
11,790

$
11,809

2018 activity:
 
 
 
Long-term debt issued

2,000

2,000

Discount, premium and other activity

(21
)
(21
)
Long-term debt as of June 30, 2018
$
19

$
13,769

$
13,788