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SHORT-TERM DEBT (Tables)
12 Months Ended
Dec. 31, 2020
Short-term Debt [Abstract]  
Schedule of Short-term Debt
Short-term debt consisted of the following (in millions of dollars):
As of December 31,
20202019
Lines of Credit
Outstanding at December 31$— $55 
Maximum month-end balance during the year$— $56 
Weighted average interest rate during the year— %2.32 %
Weighted average interest rate at December 31— %2.44 %