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LINES OF CREDIT (Tables)
 12 Months Ended
Dec. 31, 2017
Other Letters of Credit and Surety Bonds
The amounts of other letters of credit and surety bonds we have entered into as of the end of our last two years are included in the following table:
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31,
2017

DECEMBER 31,
2016

Letters of credit
$
37

$
38

Surety bonds
$
134

$
125