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SHORT-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2018
Short-term Debt [Abstract]  
Schedule of Short-term Debt
Short-term debt consisted of the following (in millions of dollars):
 
As of December 31,
 
2018
 
2017
Lines of Credit
 
 
 
Outstanding at December 31
$
49

 
$
56

Maximum month-end balance during the year
$
138

 
$
56

Weighted average interest rate during the year
2.29
%
 
2.41
%
Weighted average interest rate at December 31
2.35
%
 
2.01
%
 
 
 
 
Commercial Paper
 
 
 
Outstanding at December 31
$
—

 
$
—

Maximum month-end balance during the year
$
90

 
$
455

Weighted average interest rate during the year
1.80
%
 
0.83
%