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Fair Value of Financial Instruments, Assets and Equity Investments (Tables)
3 Months Ended
Mar. 31, 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)
March 31, 2016
 
December 31, 2015
Fair value
$
4,949

 
$
5,095

Carrying value
5,780

 
6,126