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Interest expense
 12 Months Ended
Dec. 31, 2018
Borrowing costs [abstract]  
Interest expense
 
 
Note 7
Interest expense
FOR THE YEAR ENDED DECEMBER 31
2018

2017

Interest expense on long-term debt
(918
)
(898
)
Interest expense on other debt
(133
)
(101
)
Capitalized interest
51

44

Total interest expense
(1,000
)
(955
)

Interest expense on long-term debt includes interest on finance leases of $142 million and $145 million for 2018 and 2017, respectively.
Capitalized interest was calculated using an average rate of 3.88% and 3.81% for 2018 and 2017, respectively, which represents the weighted average interest rate on our outstanding long-term debt.