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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
 
DECEMBER 31, 2016
 
  
CARRYING
VALUE

FAIR VALUE
 (LEVEL 2)

CARRYING
VALUE

FAIR VALUE
(LEVEL 2)

Long-term debt (including current maturities):
 
 
 
 
Fixed rate
$
5,768

$
6,823

$
6,061

$
6,925

Variable rate
224

225

549

550

Total Debt
$
5,992

$
7,048

$
6,610

$
7,475