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FINANCIAL CHARGES AND OTHER
 3 Months Ended
Mar. 31, 2020
Other Expense, Nonoperating [Abstract]  
FINANCIAL CHARGES AND OTHER FINANCIAL CHARGES AND OTHER
 
 
Three months ended
(unaudited)
 
March 31,
(millions of dollars)
 
2020
 
2019
Interest expense (a)
 
20

 
23

Net realized gain related to the interest rate swaps
 
—

 
(1
)
Other income
 
(1
)
 
—

 
 
19

 
22

(a) 
Includes amortization of debt issuance costs and discount costs.