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Fair Value of Financial Instruments, Assets and Equity Investments (Tables)
6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Value and Carrying Value of Long-Term Debt
The fair value and carrying value of our senior notes were as follows: 
(Dollars in millions)
June 30, 2016
 
December 31, 2015
Fair value
$
6,104

 
$
5,095

Carrying value
6,490

 
6,099