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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2015
Estimated Fair Values and Carrying Values of Long-Term Debt
The estimated fair values and carrying values of our long-term debt consisted of the following:
 
JUNE 30,
2015
 
DECEMBER 31,
2014
DOLLAR AMOUNTS IN MILLIONS
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
 
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
Long-term debt (including current maturities)
$
4,891

 
$
5,752

 
$
4,891

 
$
5,922