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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2014
Estimated fair values and carrying values of our long-term debt
The estimated fair values and carrying values of our long-term debt consisted of the following:
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31, 2014
 
DECEMBER 31, 2013
 
  
CARRYING
VALUE

FAIR VALUE
 (LEVEL 2)

CARRYING
VALUE

FAIR VALUE
(LEVEL 2)

Long-term debt (including current maturities)
$
4,891

$
5,922

$
4,891

$
5,683