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Interest expense
 12 Months Ended
Dec. 31, 2017
Borrowing costs [abstract]  
Interest expense
 
Note 7 Interest expense
FOR THE YEAR ENDED DECEMBER 31
2017

2016

Interest expense on long-term debt
(898
)
(852
)
Interest expense on other debt
(101
)
(86
)
Capitalized interest
44

50

Total interest expense
(955
)
(888
)

Interest expense on long-term debt includes interest on finance leases of $145 million and $153 million for 2017 and 2016, respectively.
Capitalized interest was calculated using an average rate of 3.81% and 3.95% for 2017 and 2016, respectively, which represents the weighted average interest rate on our outstanding long-term debt.