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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
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:
 
MARCH 31,
2018
 
DECEMBER 31,
2017
DOLLAR AMOUNTS IN MILLIONS
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
 
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
Long-term debt (including current maturities)(1):
 
 
 
 
 
 
 
Fixed rate
$
5,704

 
$
6,568

 
$
5,768

 
$
6,823

Variable rate
224

 
225

 
224

 
225

Total debt
$
5,928

 
$
6,793

 
$
5,992

 
$
7,048