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Net Interest Expense (Tables)
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Components of net interest expense
The components of net interest expense are as follows: 
Year ended Dec. 31
2018

2017

2016

Interest on debt
184

218

218

Interest income
(11
)
(7
)
(2
)
Capitalized interest (Note 17)
(2
)
(9
)
(16
)
Loss on redemption of bonds (Note 22)
24

6

1

Interest on finance lease obligations
3

3

3

Credit facility fees, bank charges and other interest
13

18

19

Keephills 1 outage interest (reversals) (Note 4(P))
—

—

(10
)
Other(1)
15

(3
)
(4
)
Accretion of provisions (Note 21)
24

21

20

Net interest expense
250

247

229


(1) During 2018, approximately $5 million of costs were expensed due to project-level financing that is no longer practicable and approximately $7 million for the significant financing component required under IFRS 15 (see Note 3).