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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2017
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,
2017
 
DECEMBER 31,
2016
DOLLAR AMOUNTS IN MILLIONS
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
 
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
Long-term debt (including current maturities):
 
 
 
 
 
 
 
Fixed rate
$
6,054

 
$
7,142

 
$
6,061

 
$
6,925

Variable rate
550

 
550

 
549

 
550

Total Debt
$
6,604

 
$
7,692

 
$
6,610

 
$
7,475