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FINANCIAL CHARGES AND OTHER
 12 Months Ended
Dec. 31, 2020
Other Expense, Nonoperating [Abstract]  
FINANCIAL CHARGES AND OTHER FINANCIAL CHARGES AND OTHER
Year ended December 31 (millions of dollars)
202020192018
Interest expense(a)
78 88 95 
Net realized loss (gain) related to the interest rate swaps7 (1)(2)
PNGTS’ amortization of realized loss on derivative instrument (Note 19)
— — 1 
AFUDC - Equity(10)(2)(1)
Other (b)
(2)(2)(1)
73 83 92 
(a)Interest expense includes amortization of debt issuance costs and discount costs amounting to approximately $2 million each year ended December 31, 2020, 2019 and 2018.
(b)Includes AFUDC Debt amounting to $1.3 million for the year ended December 31, 2020 (2019 and 2018 - less than $1 million).